The average age of three boys is 12 years and their ages are in the proportion 2 : 6 : 8. The age of the youngest boy is:  Choose the correct option:
A) 21 years
B) 8.75 years
C) 6.75 years
D) 9 years
E) None of these
Total age of 3 boys = (12 Ã— 3) years = 36 years. Ratio of their ages = 2 : 6 : 8.   Age of the youngest = (36 Ã— 3â„16) years = 6.75 years.   Answer 6.75 years
<result>C</result>
The average age of three boys is 12 years and their ages are in the proportion 2 : 6 : 8. The age of the youngest boy is: