Multiple choice

Thirty-five persons are engaged to complete a piece of work in 60 days. After 32 days, it is observed that only (2/5)th part of the work has been done. The number of extra persons to be engaged to complete the remaining work in the said period is

  1. 20

  2. 35

  3. 30

  4. 25
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D Correct answer
AI explanation

Using the man-days formula, 35 men working for 32 days completes 2/5 of the work, giving 1120 man-days for 2/5 of the work. The remaining 3/5 of the work requires 1120 * (3/2) = 1680 man-days. Since the remaining time is 28 days (60 - 32), the required number of men is 1680 / 28 = 60. As 35 men are already engaged, the number of extra persons to be engaged is 60 - 35 = 25.

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