The average age of three boys is 15 years and their ages are in proportion 3:5:7. The age in years of the youngest boys is _____?
- 9
- 15
- 21
- 27
Explanation
Let ages = 3x, 5x, 7xAverage = (3x+5x+7x)/3 = 15
15x/3 = 15
5x = 15
x = 3
Youngest = 3x = 9
Last verified on 11-03-2026
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