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?

The average age of three boys is 15 years and their ages are in propor

1.	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
Answer» C. 18

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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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