5 workers need 12 days for a job. How many days would 10 workers need at the same pace?
Answer and explanation
Correct answer: B. 6
- Step 1: Total work = 5 x 12 = 60 worker-days. Step 2. 60 / 10 = 6 days. Answer: 6. Why not the others: 24: direct proportion was used instead of inverse. 7: the numbers were added and subtracted. 12: an extra factor of 2 was applied.
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