The average age of 3 boys is 15 years. If their ages are in ratio 3:5:7, what is the age of the youngest boy?
A9 years
B12 years
C15 years
D18 years
Explanation
Sum of ages = 3 * 15 = 45 years. Let ages be 3x, 5x, 7x => 15x = 45 => x = 3. Youngest boy = 3x = 3 * 3 = 9 years.
Exam Relevance
- Topic: Averages
- Subtopic: Age Problems
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