7 men can complete a work in 52 days. In how many days will 13 men finish the same work.

If 10 men can complete a work in 12 days . In how many days can 18 men complete the same work ?

8 men can do a piece of work in 15 days. Find in how many days will 10 men finish the same work.

If 40 men can finish a piece of work in 60 days. In how many days will 75 , men finish the same work ?

If 78 men can do a work in 140 days, in how many days will 42 men do the same work ?

If 5 men working 6 hours a day can complete a work in 20 days , in how many day s will 15 men complete the work working 8 hours a day ?

12 men can complete a piece of work in 16 days. In how many days will 4 men complete the same piece of work?