The average of the first five multiples of 9 is:

A. 20

B. 27

C. 28

D. 30

Show Answer

Answer-B
Solution-

Solution(By Apex Team)


$\begin{array}{l}\text{Required average}\\ \begin{array}{l} =\Large\frac{\text { total sum of multiple of } 9}{5} \\ =\Large\frac{9+18+27+36+45}{5} \\ =27 \end{array}\end{array}$
Note that, average of 9 and 45 is also 27. And average of 18 and 36 is also 27.
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