3 pumps, working 8 hours a day, can empty a tank in 2 days. How many hours a day must 4 pumps work to empty the tank in 1 day?
Pumping hours required = 3*8*2 = 48 pumping hours
Hours/day required by 4 pumps = 48/4 = 12
If A men working A hours a day can do A units of a work in A days, then how many units of work can be completed by B men working B hours per day.
If 4 examiners can examine a certain number of answer books in 8 days by working 5 hours a day, for how many hours a day would 2 examiners have to work in order to examine twice the number of answer books in 20 days.
12 labours construct 120 toys in 8 days working 8 hours per day .
If two them leave the work , then how many days are required to do the same work with a working of 6 hours per day ?
If 9 boy working 15/2 hours a day can finish a work in 20 days, then how many days will be taken by 12 boy working 6 hours a day to finish the work, it being given than 3 boy of latter type work as much as 2 boy of he former type in the same.
If 15 men take 21 days of 8 hours each to do a piece of work. How many days of 6 hours each would 21 women take, if 3 women do as much work as 2 men?