Five men and three boys can do a piece of work in 15 days while 7 men and 8 boys can do the same work in 8 days. How long will 12 men and 8 boys take to do it?
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(5M + 3B) × 15 = (7M + 8B) × 8
⇒ 75M + 45B = 56M + 64B
⇒ M = B
So 8 men can do a work in 15 days. Hence(12 + 8)
⇒ 20men can do the same work in 6 days
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