The average age of three boys is 15 years and their ages are in proportion . What is the age in years of the youngest boy?
A. 15
B. 9
C. 18
D. 21
Answer:B
The average age of three boys is 15 years and their ages are in proportion . What is the age in years of the youngest boy?
A. 15 B. 9 C. 18 D. 21