4 workers can paint a building in 12 days. How many days would 6 workers need, working at the same pace?

Answer and explanation

Correct answer: A. 8 days

  1. Step 1: Total work = 4 x 12 = 48 worker-days. Step 2. 48 / 6 = 8 days. Answer: 8 days. Why not the others: 18 days: this treats the work as direct proportion; more workers need fewer days. 10 days: this adds and subtracts the numbers instead of using total work. 12 days: this ignores the change in workers.

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