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A and B together can complete a work in ...

A and B together can complete a work in 12 days. A alone can complete it in 20 days. If B does the work only for half a day daily, then in how many days A and B together will complete the work? `110\ d a y s` b. `11\ d a y s` c. `15\ d a y s` d. `20\ d a y s`

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