Civil Service Exam Reviewer · Ratio and Proportion · hard
15 carpenters can finish a job in 30 days. How many MORE carpenters are needed to finish it in 9 days?
- 50
- 35
- 21
- 37
Answer
B. 35
Solution
Work = 15 × 30 = 450 carpenter-days. Needed = 450 ÷ 9 = 50. Additional = 50 − 15 = 35.
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