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A can do (1)/(2) of a piece of work in 5...

A can do `(1)/(2)` of a piece of work in 5 days B can do `(3)/(5)` of the same work in 9 days and C can do `(2)/(3)` of that work in 8 days. In how many days can three of them to gether do the work ?

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