Find the average of all the numbers between 11 and 21 which are divisible by 2.  Choose the correct option.
A) 15
B) 18
C) 16
D) 22
E) None
Sol.   Average = (12 + 14 + 16+ 18+ 20 / 5) = 80 / 5= 
<gadget id="calculator">80 / 5</gadget>
<output>16</output>
16.   Answer 16
<result>C</result>
Find the average of all the numbers between 11 and 21 which are divisible by 2.