Multiple choice

If 16 men and 28 boys can do a piece of work in 10 days. What is the time taken by 12 men and 21 boys in doing the same type of work? यदि 16 आदमी और 28 लड़के एक काम को 10 दिनों में कर सकते हैं तो 12 आदमी और 21 लड़कों को उसी तरह का काम करने में कितना समय लगेगा?

  1. 14 days/दिन

  2. 15 days/दिन

  3. 6 days /दिन

  4. 40/3 days/दिन
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This is an inverse proportion problem. 16M + 28B do work in 10 days. The new group (12M + 21B) is 3/4 of the original group (12/16 = 3/4, 21/28 = 3/4). With fewer workers, more time is needed. New time = 10 × (4/3) = 40/3 days. Option A incorrectly assumes direct proportion.

Keep practicing — related questions