A can finish a piece of work in 15 days and B can do it in 10 days. They worked together for 2 days and then B goes away. In how many days will A finish the remaining work?

A's 1 day work = B's 1 day work = (A + B)'s 1 day work = = = = (A + B)'s 2 day work = = Remaining work = = = No. of days taken by A to finish the remaining work = = = = Hence, A will take 10 days to finish the remaining work.