Re: A contractor undertakes to do a job within 20 days and hires

A contractor undertakes to do a job within 20 days and hires 60 people to do it. After 5 days, he realizes that one fifth of the work is done so he hires more people. How many more man he has to hire to complete the job in time? By using Unitary method 60 people, in 5 days can complete 1/5 part of t...