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The average age of three boys is 15 years and their ages are in proportion 3:5:7. What is the age in years of the youngest boy?

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The average age of three boys is 15 years and their ages are in proportion 3:5:7. What is the age in years of the youngest boy?

A. 15
B. 9
C. 18
D. 21
3x + 5x + 7x = 45
x =3
3x = 9