Find the average of first 4 multiples of 9?
Select
A) 10 B) 12.6 C) 22.5 D) 31.3 E) 40.8
average = (9+18+27+36)/4= 
<gadget id="calculator">(9+18+27+36)/4</gadget>
<output>45/2 = around 22.5</output>
22.5   Answer is 22.5
<result>C</result>
Find the average of first 4 multiples of 9?