Present ages of A and B are in ratio 3:4. After 5 years, the ratio becomes 4:5. What is A’s present age?
A12 years
B15 years
C18 years
D20 years
Explanation
Let ages be 3x and 4x. (3x + 5)/(4x + 5) = 4/5 => 5(3x + 5) = 4(4x + 5) => 15x + 25 = 16x + 20 => x = 5. A’s age = 3x = 15 years.
Exam Relevance
- Topic: Averages
- Subtopic: Age Problems
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