A certain number of men complete a work in 160 days. If there were 18 men more, the work could be finished in 20 days less. How many men were originally there?
Explanation:
Let x men can complete the work in 160 days, whereas (x + 18) men can complete the work in 140 days.
⇒ x × 160 = (x + 18) × 140
⇒ 8x = 7(x + 18)
⇒ x = 7 × 18 = 126
Hence, option (d).
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