1] Find the average of first nine multiples of 3
a]12 b]12.5 c]15 d]18.5

average = 3[1+2+3+4+5+6+7+8+9] / 9 = (3*45) /9 = 15

2] Find the average of first twenty multiples of 7
a]72 b]42.5 c]15.6 d]73.5

3] Find the average of first five multiples of 3
a]12 b]12.5 c]15 d]9

4] Find the average of first five multiples of 4
a]12 b]12.5 c]15 d]18.5

5] Find the average of first ten multiples of 3
a]12 b]16.5 c]15 d]18.5