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P can do a piece of work in 30 days. Q do the same work in 40 days. R can do it in 35 days. P and R worked for 4 days and handed it to Q. Q worked for some days and handed it again to P and R 6 days before completing the work. For how many days did Q work?

A 15 (5/21) days

B 10 days

C 25 days

D 5 days

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