If the number of quantities in group A is 10 and in group B is 8, and their individual average is 24 and 16 respectively, find the combined average of the two groups.

Average age of a group of 30 boys is 16 years. A boy of age 19 leaves the group and a new boy joins the group. If the new average age of the group is 15.8 years, find the age of the new boy.

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

If the average of m numbers is n*n and that of n numbers is m*m , then the average of m+n numbers is

Find the average of first 20 consecutive natural numbers.

The average of 6 numbers is 5. The first number is increased by 2, second by 4, third by 8 and so on. The average of new numbers is