The average of 12 numbers is 18. Find the new average when
A. The average of first 10 numbers is 20.
B. Each number is multiplied by 6.

The average of 20 numbers is 15 and the average of first five is 12.The average of the rest is

What will be the average of first 20 odd numbers ?

Find the average of squares of first 10 numbers.

The average of 10 numbers is 41. The average of first 3 numbers is 39.4 and the average of last 4 numbers is 43.5. 4^(th) number is 2 more than the 5^(th) number and 0.2 more than the 6^(th) number. What is the average of the 4^(th) and 6^(th) numbers

What is the average of first 12 natural numbers?

What is the average of first 12 natural numbers?

The average of 9 numbers is 18. If the average of first five numbers is 19 and the average of last 5 numbers is 17, find the 5th number.