A contractor estimated that a classroom block would take 60 days to build with 15 workers. If only 10 workers are hired, how many days will the construction take?
Answer and explanation
Correct answer: A. 90 days
- Step 1: Total worker-days = 15 workers 60 days = 900 worker-days. Step 2. Days needed for 10 workers = 900 worker-days ÷ 10 workers = 90 days. Answer: 90 days. Why not the others:* 40 days assumes direct proportion; 75 days is an estimation error; 100 days assumes 9 workers.
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