X, y and z can do a piece of work 12, 15 and 20 days respectively. They began the work together , but z left 4 days before the completion of the work
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They started work together, but Y left after 2 days. In what time will the remaining work be completed by X and Z? .... A can do a piece of work in 25 days and B can finish it in 20 days.
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