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? | MCQ Hive

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Q 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 A. 15
B B. 9
C C. 18
D D. 21

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