P can do a work in the same time in which Q and R together can do it. If P and Q work together, the work can be completed in 10 days. R alone needs 50 days to complete the same work. then Q alone can do it in__________?

P can do a work in the same time in which Q and R together can do it.

1.	P can do a work in the same time in which Q and R together can do it. If P and Q work together, the work can be completed in 10 days. R alone needs 50 days to complete the same work. then Q alone can do it in__________?
A.	30 days
B.	25 days
C.	20 days
D.	15 days
Answer» C. 20 days

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