Find the average of first 4 multiples of 5?	Choose one
A) 10  B) 15  C) 12.5  D) 13  E) 21
average = (5+10+15+20)/4= 
<gadget id="calculator">(5+10+15+20)/4</gadget>
<output>25/2 = around 12.5</output>
12.5   Answer is 12.5
<result>C</result>
Find the average of first 4 multiples of 5?