If 3 men or 9 boys can finish a piece of...

If 3 men or 9 boys can finish a piece of work in 21 days, in how many days can 5 men and 6 boys together do the same piece of work? `8\ d a y s` b. `12\ d a y s` c. `14\ d a y s` d. cannot be determined e. none of these

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