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S is 7 years younger than R. If the ratio of their ages is 7 : 9, what is S's age?
A24.5 years
B16 years
C28 years
D18 years
Answer & Solution
Correct answer: A. 24.5 years
1. Let ages be 7k and 9k; the difference 9k − 7k = 2k equals 7 years.
2. So k = 3.5.
3. S's age = 7k = 7 × 3.5 = 24.5 years.
_Source: RRB Group D CEN-02/2018 PYQ, Q.66._
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