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A can do a piece of work in 14 days whic...

A can do a piece of work in 14 days which B can do in 21 days. They begin together but 3 days before the completion of the work, A leaves off. The total number of days to complete the work is `6 3/5` b. `8 1/2` c. `10 1/5` d. `13 1/2`

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