The average age of three boys is 40 years and their ages are in proportion 8:10:22. What is the age in years of the youngest boy?  Choose the most appropriate option:
A) 8
B) 9
C) 7
D) 6
E) 5
8x + 10x + 22x = 40   x 8  + 10  + 22= 
<gadget id="calculator">8  + 10  + 22</gadget>
<output>40</output>
40   x=1   8x = 8   8nswer:8
<result>A</result>
The average age of three boys is 40 years and their ages are in proportion 8:10:22. What is the age in years of the youngest boy?