Find the average of all the numbers between 9 and 26 which are divisible by 5.
Choose one:
A) 15	B) 19	C) 18	D) 22	E) None
Sol.   Average = (10 + 15 + 20 + 25 / 4) = 70 / 4= 
<gadget id="calculator">70 / 4</gadget>
<output>35/2 = around 17.5</output>
17.5   Answer 18
<result>C</result>
Find the average of all the numbers between 9 and 26 which are divisible by 5.