Multiple choice

If (\frac{4}{5}) part of a work is done by 12 men in 15 days, how many men will be required to complete the whole work in 25 days?

  1. 10 men

  2. 12 men

  3. 9 men

  4. 11 men
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

If 4/5 of work requires 12 men × 15 days = 180 man-days, then complete work needs 180 × 5/4 = 225 man-days. To finish in 25 days: 225/25 = 9 men. Option A (10 men) would be correct if you incorrectly used direct proportion without accounting for the 4/5 fraction properly.

Keep practicing — related questions