Question : The average of 8 numbers is 21. If each of the numbers is multiplied by 8, the average of the new set of numbers is:

Question : The average of nine consecutive numbers is $n$, if the next two numbers are also included the new average will be:

Question : Three numbers are such that the average of the first two numbers is 2, the average of the last two numbers is 3 and the average of the first and the last numbers is 4. What is the average of the three numbers?

Question : If the sum of squares of two real numbers is 12 and the product of the numbers is 4, find the difference between the numbers.

Question : Three numbers are such that the average of the first two numbers is 2, the average of the last two numbers is 3 and the average of the first and last number is 4, then the average of the three numbers is equal to: