" Q.12.A.does "(7)/(10)" part of work in "15" days.After that he "

A complete (7)/(10) of a work in 15 days.After that he completes the work in 4 days with help from B.Find the number of days to complete the whole work if A and b work together from start.

‘A’ completes a work in 12 days. ‘B’ completes the same work in 15 days. ‘A’ started working alone and after 3 days B joined him. How many days will they now take together to complete the remaining work?

A can finish a work in 12 days and B can do it in 15 days. ’After A had worked for 3 days, B also joined A to finish the remaining work. In how many days, the remaining work will be finished?

12 men, working 8 hours a day, complete a piece of work in 10 days. To complete the same work in 8 days, working 15 hours a day, the number of men required is_____

A can do a piece of work in 10 days and B can do it in 15 days. After they have worked together for 4 days, A does away and B completes the remaining work. In how many days B complete the remaining work ?