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IBPS Clerk: Quantitative Aptitude for IBPS Clerk

IBPS Clerk · Work through your exam, one topic at a time.

All guide sections

Quantitative Aptitude for IBPS Clerk

IBPS Clerk Quantitative Aptitude rewards calculation speed and clean method. Prelims has 35 questions in 20 minutes; Mains has 50 questions in 45 minutes. Topics include simplification/approximation, number series, quadratic equations, data interpretation, arithmetic word problems and mensuration.

Core rules

  • Percentage change = (new − old)/old × 100. For successive changes use a + b + ab/100.
  • Profit and loss: profit% is on cost price; discount% is on marked price. SP = MP(1 − d) and CP = SP/(1 + p).
  • Time and work: take total work as the LCM of the days; add rates for people working together.
  • Interest: SI = P×r×t/100; CI = P[(1 + r/100)^t − 1].
  • DI: note the units and the year before calculating; approximate only when the options allow it.
  • Series: test differences, ratios, squares/cubes and alternating patterns before assuming a rule.

Worked example

A trader marks an article 40% above cost and gives 25% discount. Let CP = 100. MP = 140. SP = 140 × 0.75 = 105. Profit = 105 − 100 = 5, so profit% = 5%. Shortcut: 40 − 25 − (40×25/100) = 5%.

Traps

Taking discount on CP instead of MP; using the arithmetic mean for average speed instead of total distance/total time; sign errors in quadratic roots; ignoring “approximately”; mixing SI and CI; reversing ratio order.