If 24 men can do a piece of work in 28 hours, in how many hours will 16 men do it?
60 hours
42 hours
56 hours
72 hours
If 9 men can do a piece of work in 16 days, then how many men would do it in 24 days.
If 15 men or 24 women or 36 boys can do a piece of work in 12 days, working 8 hours a day, how many men must be associated with 12 women and 6 boys to do another piece of work 2.25 times in 30 days working 6 hours in a day?