Multiple choice

30 children can do a piece of work in 16 days. How many children would be required to do the same work in 20 days?

  1. 12

  2. 24

  3. 36

  4. 48

  5. 60
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This is an inverse proportion problem - more children means fewer days. Total work = 30 × 16 = 480 child-days. To complete in 20 days, children needed = 480/20 = 24. Option A (12) would give 12×20 = 240 child-days, half the required work. Option C (36) would give 36×20 = 720 child-days, exceeding the requirement.

Keep practicing — related questions