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 35 teachers, how many pupils must be added so that the ratio becomes 40 : 1?
- 1400
- 1050
- 10
- 350
Answer
D. 350
Solution
Current pupils = 30 × 35 = 1050. Needed = 40 × 35 = 1400. Add 350.
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