Quantitative Aptitude: notes & practice

Simplification, number series, data interpretation, percentages, profit and loss, interest, time and work, speed and distance.

Key topics

• Simplification & Approximation

  BODMAS, squares to 30, cubes to 20, fraction-percentage table.

• Data Interpretation

  Tables, bar, line and pie charts; calculate only what is asked.

• Percentage, Profit & Loss

  Profit % on cost price; successive change a + b + ab/100.

• Simple & Compound Interest

  SI = PRT/100; CI = P(1 + R/100)^T − P.

• Time & Work, Pipes

  Use LCM of days as total work.

• Speed, Distance & Time

  km/h × 5/18 = m/s; relative speed for trains and boats.

• Ratio, Average, Mixtures

  Alligation method for mixtures; average = sum / count.

Practice questions

Our own practice questions in the style of past papers.

1. 1. What is 25% of 480?

   A. 100B. 120C. 140D. 96

2. 2. An item bought for ₹800 is sold for ₹1,000. Profit %?

   A. 20%B. 25%C. 15%D. 30%

3. 3. Simple interest on ₹5,000 at 8% per year for 3 years?

   A. ₹1,000B. ₹1,200C. ₹1,500D. ₹1,800

4. 4. A can finish a job in 10 days and B in 15 days. Together they take:

   A. 5 daysB. 6 daysC. 8 daysD. 12 days

5. 5. A train at 72 km/h covers how many metres per second?

   A. 15B. 20C. 25D. 18

6. 6. Average of 12, 18, 24 and 30?

   A. 20B. 21C. 22D. 24