Home > The average age of three boys is 15 years. If their ages are in ratio 3:5:7, the age of the youngest boy is

The average age of three boys is 15 years. If their ages are in ratio 3:5:7, the age of the youngest boy is ?

A)  9 years
B)  15 years
C)  18 years
D)  21 years
Answer: 9 years

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