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A and B can complete a work in 18 days a...

A and B can complete a work in 18 days and 15 days respectively. They started doing the work together but after 3 days A had to leave and B alone completed the remaining work. The whole work was completed in `9 3/4d a y s` b. `10 1/4\ d a y s` c. `12 1/2d a y s` d. `12 3/4d a y s`

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