Question

Average of first five multiples of 3 will be

Answer 1

Average=3(1+2+3+4+5) / 5=45/5=9

Answer 2

first 5 multiple of 3 are 3 ,6,9,12,15
sum of 5 multiple =5(3+15)/2
=5×18/2
=5×9
=45

avg is =total sum /5
= 45/5
=9