The average age of three boys is 120 years and their ages are in proportion 2:6:12. What is the age in years of the youngest boy?
Choose the correct answer:
A) 8
B) 9
C) 7
D) 12
E) 5
2x + 6x + 12x = 120   x =6   2x = 12   Answer:12
<result>D</result>
The average age of three boys is 120 years and their ages are in proportion 2:6:12. What is the age in years of the youngest boy?