If 30 men can build a wall 56 meters long in 5 days, what length of a similar…

2023

If 30 men can build a wall 56 meters long in 5 days, what length of a similar wall can be built by 40 men in 3 days?

  1. A.

    46.8 meters

  2. B.

    45.8 meters

  3. C.

    44.8 meters

  4. D.

    42.8 meters

Attempted by 22 students.

Show answer & explanation

Correct answer: C

Method: use man-days since work is proportional to number of men × number of days.

  1. Compute output per man-day: 56 ÷ (30 × 5) = 56 ÷ 150 = 0.3733... meters per man-day.

  2. Total man-days for 40 men in 3 days = 40 × 3 = 120 man-days.

  3. Length built = 120 × 0.3733... = 44.8 meters.

Answer: 44.8 meters

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