The average age 9 men of a gang are the same as it was 2 years ago, because an old number has been replaced by a younger number. Find how much younger is the new men than the old number?	Choose the correct choice:
A) 10 B) 12 C) 18 D) 22 E) 24
9 * 2= 
<gadget id="calculator">9 * 2</gadget>
<output>18</output>
18 years   18
<result>C</result>
The average age 9 men of a gang are the same as it was 2 years ago, because an old number has been replaced by a younger number. Find how much younger is the new men than the old number?