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X and Y together can do a piece of work ...

X and Y together can do a piece of work in 30 days. Y and Z together can do the work in 20 days. X starts the work and works for 15 days then Y takes that work and works for 27 days. Finally Z finishes the remaining work in 9 days. In how many days Y alone can complete the entire work?

A

A) 60

B

B) 45

C

C) 50

D

D) 65

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