A does half as much work as B in one-third of the time taken by B. If together they take 10 days to complete a work, then the time take by B alone to do it would have been__

A and B together can do a piece of work in 16 days and B and C together can do the same work in 24 days. From starting A and B worked for 4 days and 7 days respectively, when A lefts the work then C joins the work and he works for 23 days and complete the work. Then find in how many days will C complete the work alone?

Tina can complete a piece of work in 10 days. Mina is $$ 33 {1\over3}$$%  less efficient than Tina. How many days are required to both to complete the work.

X, Y and Z take 18 days to complete a piece of work. If X works alone he finishes the work in 36 days and if Y works alone he finishes it in 60 days. How long will it take Z to complete the work alone?

A and  B can complete a work in 15 days and 10 days respectively. They started doing the work together but after 2 days B had to leave and A alone completed the remaining work. The whole work was completed in-

A can do a work in 6 days and B can do the same work in 12 days. If A, B and C together can do the same work in 4 days, then in how much days C can do it alone?

8 men working for 9 hours a day complete a piece of work in 20 days. In how many days can 7 men working for 10 hours a day complete the same piece of work?

A works twice as fast as B and B works twice as fast as C. All three working together can finish a task in 4 days with the help of D. If D alone can finish the same task in 16 days, then in how many days will A alone finish 75 % of the same task?