Question

if 80 men can do a piece of work in 10 days, in how many days can 20 men do the same piece of work​

Answer 1

Step-by-step explanation:

If 80 man can do a piece of work in 10 days.

Then 40 men will take double time to do the work = 10*2 = 20 days.

If the efficiency is reduced in half then the time taken will be double.

Hope it helps.