Civil Service Exam Reviewer · Ratio and Proportion · medium
10 workers can finish a job in 15 days. Working at the same rate, how many days will 5 workers take?
- 30 days
- 7.5 days
- 20 days
- 31 days
Answer
A. 30 days
Solution
Total work = 10 × 15 = 150 worker-days. Days = 150 ÷ 5 = 30. (Inverse proportion.)
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