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2 men and 7 boys can do a piece of work ...

2 men and 7 boys can do a piece of work in 4 days. It is done by 4 men and 4 boys in 3 days. How long would it take for one man or one boy to do it ?

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The correct Answer is:
one man can finish it in 5 days and boy in 60 days.
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