A batsman has an average of 28 runs in 10 innings. How many runs must he score in his next innings to increase his average to 32?

The average of 8 numbers is 25. If the average of first three numbers is 22 and the average of next three numbers is 26, what is the average of the remaining two numbers?

The average of 12 numbers is 18. If each number is increased by 2 and then each resulting number is divided by 2, what is the new average?

The average of 25 consecutive even numbers is 60. What is the average of the last 10 of these numbers?