Question

A bulding project takes 15 men working 8 hours daily for 12 days to complete. How long will it take for 5 men to finish the same project working 6 hours daily?

Answer 1

5 men take 3 times as long as 15 men to do the same job in the same time, so it would take 3*12 days=36 days to do the job if they were working 8 hours a day. But they're only working 6 hours a day, so it will take them 8/6=4/3 times as long=4/3*36=48 days working only 6 hours per day.