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A and B can do a piece of work in 28 and...

A and B can do a piece of work in 28 and 35 days respectively. They began to work together but A leaves after some time and B completed the remaining work in 17 days. After how many days did A leave? `7 5/9d a y s` b. `8\ d a y s` c. `9\ d a y s` d. `14 2/5d a y s`

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