7. A cand a piece of work in 20 days and in 15 They worked together and then A left How long will take to this memang won A in a piece of work in 15 days and
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A can do a piece of work in 20 days and B in 15 days .They worked together on it for 6 days and then, A left . In how many days will B finish the remaining work ?
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4 1/2
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