10 workers need 6 days for a job. How many days would 4 workers need at the same pace?
Answer and explanation
Correct answer: D. 15
- Step 1: Total work = 10 x 6 = 60 worker-days. Step 2. 60 / 4 = 15 days. Answer: 15. Why not the others: 2.4: direct proportion was used instead of inverse. 12: the numbers were added and subtracted. 1.2: an extra factor of 2 was applied.
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