Civil Service Exam Reviewer · Ratio and Proportion · medium
12 workers can finish a job in 12 days. Working at the same rate, how many days will 9 workers take?
- 9 days
- 16 days
- 15 days
- 17 days
Answer
B. 16 days
Solution
Total work = 12 × 12 = 144 worker-days. Days = 144 ÷ 9 = 16. (Inverse proportion.)
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