Present ages of father and son are in ratio 7:2. After 10 years, ratio will be 9:4. What is the father’s present age?
A35 years
B42 years
C49 years
D56 years
Explanation
(7x + 10) / (2x + 10) = 9 / 4 => 4(7x + 10) = 9(2x + 10) => 28x + 40 = 18x + 90 => 10x = 50 => x = 5. Father’s age = 7 * 5 = 35 years.
Exam Relevance
- Topic: Averages
- Subtopic: Age Problems
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