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If 12 men and 16 boys can do a piece of ...

If 12 men and 16 boys can do a piece of work in 5 days; 13 men and 24 boys can do it in 4 days, then the ratio of the daily work done by a man to of a boy is `2:1` b. `3:1` c. `3:1` d. `5:4`

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