3 workers need 20 days to finish a job. How many days do 5 workers need at the same pace?
Answer and explanation
Correct answer: A. 12 days
- Step 1: The total work is 3 x 20 = 60 worker-days. Step 2. 60 / 5 = 12 days. Answer: 12 days. Why not the others: 33.3 days: direct proportion was used instead of inverse. 18 days: the numbers were added and subtracted. 16.7 days: an extra factor of 2 was applied.
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