The average age 9 members of a committee are the same as it was 4 years ago, because an old number has been replaced by a younger number.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 one:	A) 20 years	B) 21 years	C) 18 years	D) 29 years	E) 36 years
9 * 4= 
<gadget id="calculator">9 * 4</gadget>
<output>36</output>
36 years   Answer:36 years
<result>E</result>
The average age 9 members of a committee are the same as it was 4 years ago, because an old number has been replaced by a younger number.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?