A can do a work in 20 days and B in 50 days. If they work on it together for 5 days, then what fraction of work is left?

Babulal can do a work in 36 days while Rajesh can do the same in 48 days. If Babulal  work for ‘x’ days while Rajesh work for ‘x+2’ days then one-third of the work is complete. Find the value of x.

A and B together can complete a work in 20 days. A is 20 percent more efficient than B, B alone can complete the same work in how many days?

12 persons can do a piece of work in 4 days. How many persons are required to complete 8 times the work in half the time?