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CSA Civil Service Exam practice questions

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Question 1Verbal Reasoning

In a civil service verbal reasoning item, a passage states: "The agency's new records policy took effect in March, but full compliance across regional offices was not documented until the following quarter." Which inference is best supported?

  1. Regional offices were never required to comply.
  2. Documented compliance lagged behind the policy's effective date. Correct answer.
  3. The policy was cancelled before the following quarter.
  4. All regional offices were fully compliant by March.

Explanation

The passage distinguishes the effective date (March) from when compliance was actually documented (the next quarter). A valid inference stays within what the text states, so it can only conclude that documented compliance came later than the start date, not that compliance itself was immediate or that the policy ended.

Question 2Verbal Reasoning

A memo reads: "Because the training budget was reduced, the department postponed the advanced certification course." Which statement identifies the stated cause?

  1. The department had too few instructors.
  2. The training budget was reduced. Correct answer.
  3. The certification course was scheduled too early.
  4. The advanced certification course was unpopular.

Explanation

The word "because" signals the cause-effect relationship: the reduced training budget is presented as the reason for postponing the course. Recognizing explicit causal markers is a core verbal reasoning skill, and only the budget reduction is named as the cause.

Question 3Verbal Reasoning

Choose the word that best completes the sentence in a formal administrative report: "The committee's findings were ___ by the subsequent audit, which confirmed every major conclusion."

  1. omitted
  2. postponed
  3. undermined
  4. corroborated Correct answer.

Explanation

The clause after the blank says the audit confirmed every major conclusion, so the missing word must mean "supported or confirmed." "Corroborated" carries exactly that meaning and fits the formal register of an administrative report.

Question 4Verbal Reasoning

A notice states: "Applicants must submit proof of residency; otherwise, their files will be returned unprocessed." An applicant submits a complete file without proof of residency. What follows most directly?

  1. The applicant will be offered an alternate form.
  2. The file will be returned unprocessed. Correct answer.
  3. The file will be processed after a short delay.
  4. The applicant's residency will be verified automatically.

Explanation

The notice sets a strict conditional: without proof of residency, files are returned unprocessed. Applying that rule to the stated facts yields the direct consequence that the file is returned, with no implied exceptions such as delays or automatic verification.

Question 5Verbal Reasoning

Which sentence uses the semicolon correctly in the context of a formal government memorandum?

  1. The deadline is Friday; which is soon.
  2. The deadline is Friday; however, extensions may be requested in writing. Correct answer.
  3. The deadline is Friday; and extensions may be requested.
  4. The deadline is Friday; because extensions exist.

Explanation

A semicolon may join two independent clauses, especially when a conjunctive adverb such as "however" links them. In option 0, both sides are complete clauses and the connector is properly punctuated, which is standard in formal memoranda.

Question 6Verbal Reasoning

In the sentence "The supervisor reviewed the report carefully," which word functions as the adverb?

  1. carefully Correct answer.
  2. reviewed
  3. report
  4. supervisor

Explanation

An adverb modifies a verb, adjective, or other adverb and often ends in "-ly." Here "carefully" modifies the verb "reviewed," describing how the action was performed, which is the defining function of an adverb.

Question 7Verbal Reasoning

A passage notes: "Most field offices reported improved turnaround times, though two remote offices reported no change." Which statement avoids overgeneralizing the data?

  1. Remote offices always perform worse than others.
  2. No field office improved its turnaround time.
  3. Every field office improved its turnaround time.
  4. Turnaround times improved in most, but not all, reporting offices. Correct answer.

Explanation

The passage says "most" offices improved while two reported no change, so the accurate summary preserves that qualification. Careful verbal reasoning requires matching the scope of the claim to the scope of the evidence rather than converting "most" into "all."

Question 8Verbal Reasoning

Choose the option that best replaces the underlined portion for clarity in a public notice: "The forms were submitted by the applicants that were incomplete."

  1. The forms were submitted, and the applicants were incomplete.
  2. The incomplete applicants submitted the forms.
  3. The forms, which were incomplete, were submitted by the applicants.
  4. The applicants submitted incomplete forms. Correct answer.

Explanation

The original sentence ambiguously attaches "that were incomplete," leaving unclear whether the applicants or the forms were incomplete. Rewriting in active voice with clear attachment removes the ambiguity, which is the goal of editing for clarity in public notices.

Question 9Verbal Reasoning

A policy summary reads: "Overtime is authorized only when a supervisor submits a written request at least 48 hours in advance." Which scenario is consistent with the policy?

  1. An employee works overtime after a verbal request approved the same day.
  2. An employee works overtime and notifies the supervisor afterward.
  3. A supervisor submits a written request three days before the overtime is needed. Correct answer.
  4. A supervisor approves overtime by email one hour before it begins.

Explanation

The policy requires two conditions: a written request by a supervisor and at least 48 hours of advance notice. Only the scenario with a written request three days ahead satisfies both conditions, since three days exceeds the 48-hour minimum.

Question 10Verbal Reasoning

Passage: "The city consolidated three separate permit offices into a single service center. Processing times initially rose as staff learned the new system, but within six months they had fallen below the previous average." Which conclusion is best supported?

  1. Consolidation eventually reduced processing times despite an initial setback. Correct answer.
  2. The new system was abandoned after six months.
  3. Consolidation permanently increased processing times.
  4. Staff never adapted to the new system.

Explanation

The passage describes a temporary increase followed by a decline below the prior average within six months. The best conclusion acknowledges both the early difficulty and the eventual improvement, which is the overall trajectory the text reports.

Question 11Verbal Reasoning

Which pair of words best completes the analogy in an administrative context? "Audit is to accuracy as inspection is to ___."

  1. seniority
  2. speed
  3. expense
  4. compliance Correct answer.

Explanation

An audit checks whether records meet accuracy standards, so the analogy links a checking process to the standard it verifies. An inspection similarly verifies compliance with rules, making "compliance" the parallel term.

Question 12Verbal Reasoning

A directive states: "All staff who handle sensitive records must complete privacy training annually; those who do not will have system access suspended." An employee completed training two years ago and has not renewed it. What is the most reasonable expectation?

  1. The employee is permanently barred from records work.
  2. Access is suspended until annual training is renewed. Correct answer.
  3. Access continues because training was completed once.
  4. The requirement applies only to new employees.

Explanation

The directive requires annual completion and specifies suspension for noncompliance. Since the employee's training is two years old, the annual condition is unmet, so suspension of access is the stated consequence rather than a permanent bar.

Question 13Verbal Reasoning

In the sentence "Having reviewed the file, the examiner returned it to the applicant," what does the opening phrase modify?

  1. the applicant
  2. the examiner Correct answer.
  3. the file
  4. the return

Explanation

An introductory participial phrase modifies the subject of the main clause that follows it. The subject here is "the examiner," so the phrase correctly tells us who reviewed the file, avoiding a dangling modifier.

Question 14Verbal Reasoning

A report claims: "Employee satisfaction rose 12 percent after the new break policy was introduced." Which additional information would most strengthen the causal claim?

  1. Satisfaction had also risen the year before the policy.
  2. The break policy was popular with managers.
  3. The survey was conducted by an outside firm.
  4. A comparison group without the new policy showed no change in satisfaction. Correct answer.

Explanation

A causal claim is strengthened by evidence that the outcome did not occur without the supposed cause. A comparison group that lacked the policy and showed no change provides that control, reducing the likelihood that other factors explain the rise.

Question 15Verbal Reasoning

Choose the word that best completes the sentence: "The agency adopted a ___ approach, reviewing each case individually rather than applying a single rule to all."

  1. case-by-case Correct answer.
  2. uniform
  3. centralized
  4. hasty

Explanation

The contrast phrase "rather than applying a single rule to all" signals that the missing word means individualized. "Case-by-case" directly matches the described practice of reviewing each case individually.

Question 16Verbal Reasoning

A passage states: "Although the new filing system reduced paper use, it required substantial upfront training costs." Which statement best captures the author's balanced position?

  1. The system was a failure and should be reversed.
  2. The system was a complete success with no drawbacks.
  3. The system offered benefits but carried real costs. Correct answer.
  4. The system had no measurable effect on paper use.

Explanation

The concessive structure "although... it..." presents one advantage alongside one drawback. A balanced summary must acknowledge both sides, which is exactly what the third option does without overstating either the success or the failure.

Question 17Verbal Reasoning

Which sentence is written in the passive voice, as often found in formal government reports?

  1. The committee is approving the budget now.
  2. The committee will approve the budget tomorrow.
  3. The revised budget was approved by the committee. Correct answer.
  4. The committee approved the revised budget.

Explanation

In passive voice, the object of the action becomes the grammatical subject and the doer appears in a "by" phrase or is omitted. Here "the revised budget" receives the action of being approved, which is the defining passive structure.

Question 18Verbal Reasoning

A notice reads: "Only employees with at least two years of service and a satisfactory rating may apply for the transfer program." Which employee is eligible?

  1. One with three years of service and a satisfactory rating. Correct answer.
  2. One with three years of service and no rating on file.
  3. One with one year of service and a satisfactory rating.
  4. One with two years of service and an unsatisfactory rating.

Explanation

Eligibility requires both conditions to be met simultaneously: at least two years of service and a satisfactory rating. Only the first option satisfies both, since three years exceeds the minimum and the rating is satisfactory.

Question 19Verbal Reasoning

A passage asserts: "Every applicant who passed the written test also passed the interview." Which statement must be true?

  1. Everyone who passed the interview passed the written test.
  2. No one who failed the written test passed the interview.
  3. Anyone who passed the written test passed the interview. Correct answer.
  4. Some who passed the written test failed the interview.

Explanation

The statement establishes that passing the written test is sufficient for passing the interview, which is exactly what option 2 restates. The reverse implication is not given, so we cannot conclude that all interview passers also passed the written test.

Question 20Verbal Reasoning

Identify the error in this sentence from a draft report: "Neither the supervisor nor the clerks was informed of the change."

  1. There is no error; the sentence is standard.
  2. The word "neither" should be removed.
  3. The sentence should use "was" twice.
  4. The verb should agree with "clerks," the nearer subject. Correct answer.

Explanation

With "neither... nor," the verb agrees with the subject closest to it, which is the plural "clerks." Therefore the correct form is "were informed," not "was informed," making the verb agreement the error to fix.

Question 21Verbal Reasoning

A brief states: "The department reduced processing backlogs by simplifying forms; consequently, public complaints declined." Which term signals the relationship between the two clauses?

  1. consequently Correct answer.
  2. simplifying
  3. reduced
  4. public

Explanation

"Consequently" is a conjunctive adverb that marks a result or effect relationship between clauses. It tells the reader that the decline in complaints follows from the simplification of forms, making it the signal word for cause and effect.

Question 22Verbal Reasoning

Passage: "The proposal to extend office hours drew support from residents who work daytime shifts. Business owners, however, worried about staffing costs. The council postponed its vote pending further study." Which statement best reflects the council's action?

  1. The council delayed a decision to gather more information. Correct answer.
  2. The council approved the proposal with conditions.
  3. The council rejected the proposal outright.
  4. The council ignored the concerns of residents.

Explanation

Postponing a vote "pending further study" means the decision was deferred, not decided. The passage shows competing views and no final outcome, so the only accurate description of the council's action is a delay for more information.

Question 23Verbal Reasoning

An argument states: "Our office should adopt the new software because other agencies have adopted it." Which flaw best describes this reasoning?

  1. It relies on a false analogy between offices.
  2. It assumes the software is inexpensive.
  3. It confuses correlation with causation.
  4. It appeals to popularity rather than evidence of effectiveness. Correct answer.

Explanation

The argument's only support is that others have adopted the software, which is an appeal to popularity. It offers no evidence that the software works well for this office, so the reasoning does not establish the conclusion on relevant grounds.

Question 24Verbal Reasoning

Passage: "The audit found that 40 percent of sampled files lacked signatures. Because the sample was drawn only from files flagged as incomplete, the auditors cautioned against generalizing to all files." Why did the auditors add the caution?

  1. The sample was not representative of the full file population. Correct answer.
  2. The sample size was too large to analyze.
  3. Signatures are not required on any files.
  4. The audit was conducted by untrained staff.

Explanation

A sample drawn only from files already flagged as incomplete is biased toward problems, so its rate cannot be projected onto all files. The caution reflects a sampling limitation, which is the reasoning the passage explicitly provides.

Question 25Verbal Reasoning

Two statements are given: "If a form is complete, it is forwarded for review." "This form was not forwarded for review." What validly follows?

  1. The form was reviewed and approved.
  2. Nothing can be concluded about the form.
  3. The form is not complete. Correct answer.
  4. The form is complete.

Explanation

This is a valid application of modus tollens: if completeness implies forwarding, then the absence of forwarding implies the absence of completeness. The contrapositive is logically equivalent to the original conditional, so the conclusion follows necessarily.

Question 26Verbal Reasoning

In the sentence 'The clerk filed the forms quickly and accurately,' which word or phrase is the adverb modifying the verb 'filed'?

  1. accurately
  2. quickly Correct answer.
  3. forms
  4. clerk

Explanation

An adverb modifies a verb, adjective, or other adverb. Here 'quickly' and 'accurately' both modify 'filed,' but the question asks for the first-listed adverb; 'quickly' is the adverb that directly follows the verb. 'Clerk' is a noun subject and 'forms' is a noun object, so neither can be an adverb.

Question 27Verbal Reasoning

A public notice states: 'Applications must be submitted by mail; however, faxed copies will not be accepted.' Which revision best corrects the punctuation and logic of the sentence?

  1. Applications must be submitted by mail; however, faxed copies will not be accepted.
  2. Applications must be submitted by mail; however, faxed copies will not be accepted, either.
  3. Applications must be submitted by mail, however faxed copies will not be accepted.
  4. Applications must be submitted by mail; however, faxed copies will be accepted. Correct answer.

Explanation

The original sentence uses 'however' to contrast two clauses, but the second clause contradicts the first without a logical connector. The best revision keeps the semicolon before 'however' and changes 'will not' to 'will be accepted' so the contrast is logical: mail is required, but faxed copies are also accepted. Option 0 repeats the original error, option 1 uses a comma splice, and option 3 adds 'either' without fixing the contradiction.

Question 28Verbal Reasoning

A policy memo reads: 'Employees may telework up to two days per week, provided that their supervisor approves a written schedule in advance.' Which statement is a valid inference from this memo?

  1. Employees who telework two days per week need no supervisor approval.
  2. Supervisors must approve all telework requests within 24 hours.
  3. Employees who telework without prior written approval violate the policy. Correct answer.
  4. Employees may telework three days per week if their supervisor agrees.

Explanation

The memo conditions telework on advance written approval from a supervisor. Therefore, teleworking without that approval does not meet the stated condition and violates the policy. The other options add permissions or deadlines that the memo does not contain.

Question 29Verbal Reasoning

Which word best completes the sentence: 'The committee reached a ___ decision, with every member voting in favor'?

  1. unanimous Correct answer.
  2. unanimity
  3. ambiguous
  4. anonymous

Explanation

The sentence describes a decision supported by every member, which is the meaning of 'unanimous.' The adjective form is needed to modify 'decision.' 'Unanimity' is a noun and would not fit grammatically before 'decision.'

Question 30Verbal Reasoning

A report states: 'The new intake process reduced average wait times from 45 minutes to 30 minutes. However, client satisfaction scores remained unchanged.' Which conclusion is best supported by these statements?

  1. The new intake process was ineffective overall.
  2. Clients prefer longer wait times.
  3. Satisfaction scores are unreliable measures.
  4. Shorter wait times alone did not improve client satisfaction. Correct answer.

Explanation

The report shows wait times fell while satisfaction stayed the same, which supports the conclusion that reducing wait time alone did not raise satisfaction. The other options make claims about client preferences, overall effectiveness, or measurement reliability that the data do not establish.

Question 31Verbal Reasoning

In the sentence 'The auditor, after reviewing the receipts, noted several discrepancies,' what is the function of the phrase 'after reviewing the receipts'?

  1. It modifies the verb 'noted.' Correct answer.
  2. It modifies the noun 'discrepancies.'
  3. It is the main subject of the sentence.
  4. It modifies the noun 'auditor.'

Explanation

The phrase 'after reviewing the receipts' is an adverbial phrase telling when the auditor noted the discrepancies, so it modifies the verb 'noted.' It does not describe the auditor, the discrepancies, or serve as the subject.

Question 32Verbal Reasoning

A directive states: 'All travel requests must be filed at least ten business days before departure. Requests filed later will be denied unless a deputy director grants an exception.' Which situation is consistent with the directive?

  1. A request filed five days before departure is automatically approved.
  2. A request filed twelve days before departure is denied without review.
  3. A request filed five days before departure is approved by a deputy director. Correct answer.
  4. A request filed ten days before departure is denied because it is too early.

Explanation

The directive allows late requests only if a deputy director grants an exception. A request filed five days before departure is late but can be approved through that exception. The other options contradict the ten-day rule or the exception provision.

Question 33Verbal Reasoning

Which sentence uses the passive voice, as is common in formal government writing?

  1. The supervisor will approve the revised schedule.
  2. The supervisor approves revised schedules.
  3. The revised schedule was approved by the supervisor. Correct answer.
  4. The supervisor approved the revised schedule.

Explanation

In the passive voice, the subject receives the action rather than performing it. 'The revised schedule was approved by the supervisor' makes the schedule the subject and the supervisor the agent. The other sentences are active because the supervisor performs the action.

Question 34Verbal Reasoning

A notice reads: 'Only employees who have completed at least one year of service and received a satisfactory performance rating may apply for the internal transfer.' Which employee is eligible to apply?

  1. An employee with one year of service and no rating on file.
  2. An employee with three years of service and an unsatisfactory rating.
  3. An employee with six months of service and an outstanding rating.
  4. An employee with two years of service and a satisfactory rating. Correct answer.

Explanation

Eligibility requires both at least one year of service and a satisfactory rating. Only the employee with two years and a satisfactory rating meets both conditions. The others fail at least one requirement.

Question 35Verbal Reasoning

A passage states: 'All grant recipients must submit quarterly reports. Some quarterly reports are audited.' Which statement must be true?

  1. Only grant recipients submit quarterly reports.
  2. All audited reports are submitted by grant recipients.
  3. No grant recipients are audited.
  4. Some grant recipients submit reports that are audited. Correct answer.

Explanation

Since all grant recipients submit quarterly reports and some quarterly reports are audited, at least some grant recipients submit reports that are audited. The other options reverse the relationship or add restrictions not stated in the passage.

Question 36Verbal Reasoning

Identify the error in this sentence from a draft report: 'Each of the regional offices have submitted their quarterly figures.'

  1. 'have' should be 'has.' Correct answer.
  2. 'their' should be 'its.'
  3. 'Each' should be 'Every.'
  4. The sentence is correct as written.

Explanation

The subject 'Each' is singular, so the verb must be 'has,' not 'have.' The pronoun 'their' is often accepted with 'each' in modern usage, but the verb agreement error is clear. Changing 'Each' to 'Every' would not fix the verb agreement.

Question 37Verbal Reasoning

A brief states: 'The department simplified its forms, and consequently public complaints declined.' Which word in the sentence signals the cause-and-effect relationship?

  1. public
  2. consequently Correct answer.
  3. simplified
  4. declined

Explanation

'Consequently' is a conjunctive adverb that signals a result or effect. It links the simplification of forms to the decline in complaints. The other words do not express a causal relationship.

Question 38Verbal Reasoning

A proposal to extend office hours drew support from residents who work daytime shifts. Business owners, however, opposed the change because of increased security costs. Which statement best describes the structure of this passage?

  1. It presents a contrast between two groups with different interests. Correct answer.
  2. It describes a sequence of events leading to a decision.
  3. It explains why the proposal should be rejected.
  4. It compares the costs of two alternative proposals.

Explanation

The passage sets residents who support the change against business owners who oppose it, highlighting a contrast between two groups with different interests. It does not recommend rejection, compare two proposals, or narrate a sequence of events.

Question 39Verbal Reasoning

An argument states: 'Our office should adopt the new software because other agencies have adopted it.' Which flaw best describes this reasoning?

  1. It appeals to popularity rather than evidence of effectiveness. Correct answer.
  2. It attacks the character of opponents.
  3. It relies on a false dilemma between two options.
  4. It assumes that correlation implies causation.

Explanation

The argument recommends adoption solely because others have adopted it, which is an appeal to popularity. It does not present evidence that the software works well for this office. The other flaws describe different reasoning errors not present here.

Question 40Verbal Reasoning

A passage notes: 'The audit found that 40 percent of sampled files lacked signatures. Because the sample was drawn only from files processed in the last month, the finding may not represent older files.' Which statement best evaluates the passage's reasoning?

  1. The passage commits a fallacy by generalizing from a sample.
  2. The passage appropriately limits the conclusion by noting the sample's narrow scope. Correct answer.
  3. The passage assumes that signatures are unimportant.
  4. The passage proves that most files lack signatures.

Explanation

The passage reports a finding from a sample and then explicitly cautions that the sample was limited to recent files, so the finding may not apply to older files. This is a sound qualification of the conclusion. It does not claim most files lack signatures or ignore the sample's limits.

Question 41Numerical Reasoning

A provincial office receives 1,248 applications and must distribute them equally among 12 review teams. How many applications does each team receive?

  1. 114
  2. 104 Correct answer.
  3. 124
  4. 96

Explanation

Dividing 1,248 by 12 gives exactly 104, since 12 multiplied by 100 is 1,200 and 12 multiplied by 4 is 48, and the two parts sum to 1,248. Because the division produces no remainder, every review team receives an identical share of 104 applications.

Question 42Numerical Reasoning

A civil service training budget of ₱45,000 is split between two seminars in the ratio 4:5. What is the larger share?

  1. ₱24,000
  2. ₱25,000 Correct answer.
  3. ₱27,000
  4. ₱20,000

Explanation

The ratio 4:5 means nine equal parts, so one part equals 45,000 divided by 9, which is 5,000. The larger share is five parts, or 5 multiplied by 5,000, giving 25,000 pesos.

Question 43Numerical Reasoning

A clerk earns a monthly salary of ₱18,600. What is the annual salary?

  1. ₱223,200 Correct answer.
  2. ₱232,200
  3. ₱186,000
  4. ₱204,600

Explanation

An annual salary is twelve monthly salaries, and 18,600 multiplied by 12 equals 223,200 pesos. Multiplying the monthly figure by ten gives 186,000, and adding two more months of 37,200 confirms the total.

Question 44Numerical Reasoning

Which of the following numbers is divisible by both 3 and 5?

  1. 352
  2. 362
  3. 357
  4. 345 Correct answer.

Explanation

A number divisible by 5 must end in 0 or 5, and a number divisible by 3 must have digit digits summing to a multiple of 3. Only 345 ends in 5, and its digits 3+4+5 sum to 12, which is divisible by 3.

Question 45Numerical Reasoning

A government form has 350 copies. If 28 copies are used each day, after how many full days will fewer than 28 copies remain?

  1. 12 Correct answer.
  2. 11
  3. 13
  4. 14

Explanation

Dividing 350 by 28 gives 12 with a remainder of 14, because 28 multiplied by 12 is 336. After 12 full days only 14 copies remain, which is fewer than 28, so 12 is the first day on which that condition holds.

Question 46Numerical Reasoning

What is 25% of 480?

  1. 110
  2. 120 Correct answer.
  3. 140
  4. 96

Explanation

Twenty-five percent equals one quarter, and one quarter of 480 is 120. Equivalently, 0.25 multiplied by 480 gives 120, confirming the result.

Question 47Numerical Reasoning

Arrange the following fractions in ascending order: 3/4, 2/3, 5/8.

  1. 5/8, 2/3, 3/4 Correct answer.
  2. 3/4, 2/3, 5/8
  3. 2/3, 5/8, 3/4
  4. 5/8, 3/4, 2/3

Explanation

Converting to a common denominator of 24 gives 18/24, 16/24 and 15/24 for 3/4, 2/3 and 5/8 respectively. The smallest is 15/24 (5/8), then 16/24 (2/3), and the largest is 18/24 (3/4).

Question 48Numerical Reasoning

A civil service examination has 150 items. A candidate answers 80% of them. How many items remain unanswered?

  1. 25
  2. 30 Correct answer.
  3. 40
  4. 20

Explanation

Eighty percent of 150 items is 120 items answered, since 0.8 multiplied by 150 equals 120. Subtracting 120 from 150 leaves 30 items unanswered, which is the remaining 20%.

Question 49Numerical Reasoning

A clerk's salary rises from ₱16,000 to ₱18,400. What is the percentage increase?

  1. 18%
  2. 12%
  3. 15% Correct answer.
  4. 20%

Explanation

The increase is 18,400 minus 16,000, which equals 2,400 pesos. Dividing the increase by the original salary gives 2,400 divided by 16,000, or 0.15, which is a 15% increase.

Question 50Numerical Reasoning

A water tank is filled by pipe A in 6 hours and by pipe B in 12 hours. Working together, how long will they take to fill the tank?

  1. 9 hours
  2. 5 hours
  3. 3 hours
  4. 4 hours Correct answer.

Explanation

Pipe A fills one-sixth of the tank per hour and pipe B fills one-twelfth. Together they fill one-sixth plus one-twelfth, which is one-quarter of the tank per hour, so the tank fills in 4 hours.