Multiple choice

A certain number of men agreed to do a work in 40 days. 10 men did not come for work. Others completed the work in 60 days. Find the number of men who had agreed to do the work originally.

  1. 25

  2. 28

  3. 32

  4. 30

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This is an inverse proportion problem. Total work = M × 40 man-days. When 10 men are absent, (M-10) men take 60 days. Since work is constant: M × 40 = (M-10) × 60. Solving gives M = 30.