Question

A contractor has a workforce of 420 men who can finish a certain piece of
work in 9 months. How many extra men must be employ to complete the job in 7
months?
S​

Answer 1

Answer:

420 men - 9 months

x men - 7 months

Here we've to take inverse proportion.

Hence, 420*9 = x*7

3780 = 7x

x = 3780/7 = 540

men extra = 540-420 = 120 men