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A can do a piece of work in 9 days and ...

A can do a piece of work in 9 days and B can do the same in 12 days. In how days can the work be completed if A and B work together?

Text Solution

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One day work of A and B`=(1)/(9)+(1)/(12)=(7)/(36)`
So they can complete work in `(36)/(7),i.e.,5(1)/(7)`days.
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