A, b and C can alone complete a work in 10, 12 and 15 days
respectively. A and C started the work and after working for
4 days, A left and B joined. In how many days the total work
was completed ?

A can do a piece of work in 20 days and B can do same work in 25 days. Both A and B start the work and after 8 days A left. In how many days will the total work be completed ?

A,B and C can do a piece of work in 12,18 and 9 days respectively. A started the work and worked for 4 days. Then B alone worked for 2 days. How many days would C alone take to complete the remaining work?

A,B and C can do a piece of work in 12,18 and 9 days respectively. A started the work and worked for 4 days. Then B alone worked for 2 days. How many days would C alone take to complete the remaining work?

A, B and C can do a piece of work individually in 8, 12 and 15 days respectively. A and B start working, but A quits after working for - 2 days. After this, C joins B till the completion of work. In how many days will the work be completed ?