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A can do a piece of work in 15 days and ...

A can do a piece of work in 15 days and B can do it in `22 1/2` days.They worked together for 6 days and the remaining work was completed by C alone in 6 days. A, B and C together will do the same work in:
A किसी कार्य को 15 दिनों में पूरा कर सकता है एवं B उसे दिनों में पूरा कर सकता है। उन्होंने 6 दिनों तक एक साथ काम किया और शेष कार्य 6 दिनों में अकेले C ने पूरा किया। A, B और C मिलकर इस कार्य को कितने दिन में पूरा कर देंगे?

A

8

B

10

C

6

D

12

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