Question

A contractor employed 30 men to complete the project in 100 days. but later on he realized that just after 25 days only 20% of the work had been completed? how many men should be increased so that the work will be completed in 25 days less than the scheduled time?

Answer 1

if 30 men do 20%work in 25 days then they do rest 80%work in rest 75 days.
then to complete the work 25 days less than the schedule time they have to complete it in (75-25)=50 days.