Civil Service Exam Reviewer · Ratio and Proportion · hard
12 workers can complete a job in 20 days. After working for 5 days, 9 workers leave. How many more days will the remaining workers need to finish the job?
- 60 days
- 15 days
- 75 days
- 65 days
Answer
A. 60 days
Solution
Total = 240 worker-days. Done in 5 days: 60. Remaining: 180. With 3 workers: 180 ÷ 3 = 60 days.
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