A and B working together can do a work in 10 days. If A can do the work in 15 days, then how many days will B take to do the same work?

P and Q can do work separately in 10 and 20 days, respectively. In how many days can they finish it, working together?

18 women complete a work in 24 days and 24 men complete the same work in 15 days. 16 women worked for 3 days and then they left. 20 men worked for the next 2 days, and then they are joined by 16 women. In how many days will they finish the remaining work?

A and B can do a piece of work in 12 days; B and C together can do it in 15 days. If A is twice as good a workman as C, find the number of days in which B alone can do the work?

P, Q and R can complete a work in 12, 9 and 15 days respectively. Working together, they will complete the same work in:

Mohan asked 36 men to build his house in 30 day. 50% of the work got completed in just 10 days. So, Mohan removed some workers. Now, how many persons does he need to complete the remaining work in decided time?

A and B can complete a piece of work in 30 days. B and C in 10 days, which C and A in 5 days. If all of them work together, the time taken in completing the work