If the average of 5 numbers is 10, the number which should be added to make the average 12 is (a) 12      (b) 18       (c) 22     (d) 24

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 ten numbers is 7. If each number is multiplied by 12, then the average of the new set of numbers is : (a) 7 (b) 19 (c) 82 (d) 84

Find the average of the numbers 12, 14, 16,18,20

The average of N numbers is 10. If a number 6 is removed, then average becomes 12. What is the value of N?