The sum of nine consecutive natural numbers is 2088. The average of prime numbers among these numbers is

Find the average of first 20 consecutive natural numbers.

The average of square of first 6 consecutive even numbers is:

Let five odd consecutive natural numbers be P, Q, R, S and T. What is their average?

The average of three consecutive odd numbers is 43. What is the average of the smallest and largest?

If x is the average of 1², 2², 3², ..., 10² and y is the average of first 10 even natural numbers, then y is what percent of x − y?