7 men and 4 boys can complete a work in 6 days. A man completes double the work than a boy. In how many days will 5 men and 4 boys complete the work?
7 M + 4 B = 6 days and 1 man = 2 boys 7 M + 2 M = 6 days ⇒ 9M = 6 days 1 M = 6 x 9 = 54 days Now, 5 M + 2M = 7M 1 M = 54 days 7M = 54/7 = `7(5/7)` days
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