Civil Service Exam Reviewer · Ratio and Proportion · hard
The ratio of the number of pupils to teachers in a school is 30 : 1. If there are 24 teachers, how many pupils must be added so that the ratio becomes 40 : 1?
- 960
- 240
- 720
- 10
Answer
B. 240
Solution
Current pupils = 30 × 24 = 720. Needed = 40 × 24 = 960. Add 240.
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