Twenty five men can make a certain number of chairs in 80 working hours. They work for 10 hours. How many more men should now be employed so as to complete the work in another 50 working hours?

Twenty two men cann complete a piece of work in 17 days. They work for 2 days. How many more men should now be employed so as to complete the work in another 10 days?

Seventy-five men are employed to lay down a railway line in 3 months. Due to certain emergency conditions, the work was to be finished in 18 days. How many more men . should be employed to complete the work in the desired time?

10 men working 6 hours a day can complete a work in 18 days. How many hours a day must 15 men work to complete the same work in 12 days.

90 men can complete a work in 24 days working 8 hours a day. How many men are working 8 hours a day. How many men are required to complete the same work in 18 days working 7(1)/(2) hours a day ?

Fifteen men can complete a piece of work in 10 days, working 8 hours per day. How many persons are required to complete double the work in 25 days, working 6 hours per day ?