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P alone can complete a piece of work in ...

P alone can complete a piece of work in 12 days and Q can complete the same work in 18 days. With the help of R, all
three finish the work in 6 days. In how many days can R alone complete the work?

A

A)36 days

B

B)28 days

C

C)25 days

D

D)30 days

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