Average of first five multiples of 3 is
9
11
13
15
Explanation:
$=\dfrac{3\left(1+2+3+4+5\right)}{5}$
$=\dfrac{45}{5}$
=9
Next Question
Average weight of 10 people increased by 1.5 kg when one person of 45 kg is replaced by a new man. Then weight of the new man is