Question

What is the average of all numbers between 100 and 200 which are divisible by 13?

Answer 1

there are 8 no. which are between 100 and 200 which are divisible by 13.
104, 117, 130, 143, 156, 169, 182 and 195

Answer 2

Average is 149.5.

Just add the multiples of 13 in multiplication table from 8 to 15.

And then divide it by the total number of multiples.