Multiple choice

A work which could be finished in 9 days was finished 3 days earlier after 10 more men joined. The number of men employed was?

  1. 20

  2. 22

  3. 24

  4. 18
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A Correct answer
Explanation

Let M be the number of men. M * 9 = (M + 10) * 6. 9M = 6M + 60. 3M = 60, M = 20.

AI explanation

Using the man-days formula, the work requires 9M man-days, where M is the initial number of men. The work was finished in 6 days by (M plus 10) men, so the equation is (M plus 10) times 6 equals 9M. Solving 6M plus 60 equals 9M yields 3M equals 60. The result is 20 men.

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