What is the product of the average of first ten positive odd numbers and the average of first fifteen positive even numbers?

160

1st ten positive odd numbers are 1, 3, 5, 7, 9, 11, 13, 15, 17, 19

Sum of 1st 10 positive odd numbers = 100

Average = 10

1st 15 positive even numbers = 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30

Sum of 1st 15 positive even numbers = 240

Average = 16

Product of average of both = 10 x 16 = 160