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The average age of three boys is 15 years. If their ages are in the ratio 3 : 5 : 7, what is the age of the youngest boy?
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- 9 years
- 8 years
- 8 years 3 months
- None of these
- 9 years
Correct Option: A
Let the age of three boys be 3k, 5k and 7k
According to question ,
| Average age = | = 5k | |
| 3 |
and, 5k = 15 ⇒ k = 3 years
The age of the youngest boy = 3k = 9 years.
