Average of 13 results is 65, if the average of first seven results is 62 and the average of last seven results is 67, then the seventh result is :

The average marks of 13 papers are 40. Average of first 7 is 42 and last 7 is 35. Marks obtained in the 7th paper are

If x is the average of 1², 2², 3², ..., 10² and y is the average of first 10 even natural numbers, then y is what percent of x − y?

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

The average of square of first 6 consecutive even numbers is:

The average of four numbers 70, x6, 5x and 11x is 71. If x represents the same digit, then x² + 1 is equal to