15 men can do a piece of work in 56 days. How many men are needed to do the work in 7 days?
Explanation:
15 men can do a piece of work in 56 days.
∴ M1 = 15, D1 = 56 days
Let x be the number of men needed to do the same work in 7 days.
∴ M2 = x, D2 = 7 days
∵ Work done by 15 men in 56 days = Work done by x men in 7 days
∴ M1 × D1 = M2 × D2
∴ 15 × 56 = x × 7
∴ x = 120 men
Hence option (b).
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