Quantitative Aptitude and Reasoning
Quantitative Aptitude and Reasoning tests speed and accuracy in arithmetic and logical problems. The ADEO paper uses school-level mathematics, so concept clarity and short methods matter more than long calculation.
Core areas
- Arithmetic: percentage, ratio, average, profit and loss, simple and compound interest, time-work, speed-distance and mensuration.
- Reasoning: number and letter series, coding-decoding, blood relations, direction sense, syllogism, Venn diagrams and seating.
- Use base values, the unitary method and option elimination.
- In time-work, one day's work = 1/n; in compound interest, use successive growth factors.
Worked example
A shopkeeper marks an item 25% above cost and gives a 10% discount. Let cost = 100. Marked price = 125. Selling price = 125 × 0.90 = 112.5. Profit = 12.5 on 100, so profit percent = 12.5%.
Traps
Successive percentages do not add: 25% mark-up then 10% discount is not 15% profit. In average questions, a new member changes the total, not just the average. In syllogism, follow only the statements, not real-world truth. In direction sense, track left and right from the person's facing direction. Convert units before comparing.