### The average of first five multiples of 3 is:

A. 9

B. 10

C. 8

D. 11

First five multiples of three are: 3, 6, 9, 12, 15. \begin{aligned}\text{ Average }&=\frac{3+6+9+12+15}{5}\\ &=\frac{45}{5}\\ &=9\end{aligned}
$\text { Average }=\Large\frac{3+15}{2}\\ =9$