A certain number of men can finish a piece of work in 20 days. If however there were 10 men less it will take 20 days more for the work to be finished. How many men were there originally?
Explanation:
Let the number of men initially be 'm'.
m men can complete the work in 20 days while (m - 10) men can complete the same work in 40 days.
∴ m × 20 = (m - 10) × 40
⇒ m = 2m - 20
⇒ m = 20
Hence, option (d)
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