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a boy working can 71 112 men and 16 bors...

a boy working can 71 112 men and 16 bors can do a piece of work in 5 days: 13 men and boys can do it in 4 days, then the ratio of the daily work done by a man to that of a boy 18, (a) 2:1 (9.S.C. 1999)

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