The average age 10 members of a committee are the same as it was 2 years ago, because an old number has been replaced by a younger number.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 member than the old number?  Choose the correct choice from the following answers:
A) 20
B) 99
C) 77
D) 26
E) 12
10 * 2= 
<gadget id="calculator">10 * 2</gadget>
<output>20</output>
20 years   20nswer: 20
<result>A</result>
The average age 10 members of a committee are the same as it was 2 years ago, because an old number has been replaced by a younger number.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 member than the old number?