Discussion

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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