If 12 workers can build a wall in 15 days, working 6 hours per day, then in how many days can 10 workers build two such walls, if they work for 4 hours per day?

  1. A. 27 days
  2. B. 52 days
  3. C. 54 days ✓
  4. D. 26 days

Correct Answer: C. 54 days

Explanation

Using the formula \frac{M_1 \times D_1 \times H_1}{W_1} = \frac{M_2 \times D_2 \times H_2}{W_2}, we get \frac{12 \times 15 \times 6}{1} = \frac{10 \times D_2 \times 4}{2}. Solving for D_2, D_2 = \frac{12 \times 15 \times 6 \times 2}{10 \times 4} = 54 days.

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