Question

36 men can complete a piece of work in 21 days. In how many days will 12 men finish it ?​

Answer 1

Answer:

Given, 36 men can finish a piece of work in 25 days

=> The number of man-days = 36*25 = 900

Let x be the number of days taken by the 15 men to do the piece of work

=> The number of man-days = 15x

But the number of man-days remains constant.

=> 15x = 900

x = 900/15 = 60

=> 15 men take 60 days to complete the piece of work.

Answer 2

Answer:

Solution:

36 men can complete a piece of work in 20 days.

So, 1 men can complete the piece of work in 36×20 = 720 days.

So, 12 men can complete the piece of work in 720/ 12 = 60 days.

Therefore in 60 days, 12 men complete the work.