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P and Q can finish a work in 15,10 days ...

P and Q can finish a work in `15,10` days respectively. Q starts the work and leaves it after 5 days. The number of days in which P can complete the work is

A

`6 (1)/(2)` days

B

`7 (1)/(2)` days

C

8 days

D

9 days

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