Rakesh can do a piece of work in 20 days. How much work can he do in 4 days.
Given,
Time taken by Rakesh to do a piece of work = 20 day
∵Work done by Rakesh in 1 day = 
∴ work done by him in 4 days = 
1
Rakesh can do a piece of work in 20 days. How much work can he do in 4 days.
Given,
Time taken by Rakesh to do a piece of work = 20 day
∵Work done by Rakesh in 1 day =
∴ work done by him in 4 days =