The average of 5 numbers is 43. What is the correct expression for the new average whentwo numbers `y and 3y` are added to it?

The average of 8 numbers is 12. If each number is increased by 2, the new average will be

The average of 12 numbers is 15. If each number is increased by 1, find the new average.

The average of 11 numbers is 7. If every number is doubled, what will be the new average of the numbers?

The average of 50 consecutive natural numbers is x. What will be the new average when the next four natural numbers are also included ?