Civil Service Exam Reviewer · Ratio and Proportion · hard
Two numbers are in the ratio 1 : 7. If 10 is added to each, the ratio becomes 1 : 3. What is the larger of the original numbers?
- 45
- 5
- 55
- 35
Answer
D. 35
Solution
Let the numbers be 1k and 7k. (1k + 10)/(7k + 10) = 1/3 → k = 5. Larger = 7 × 5 = 35.
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