The average of eight successive numbers is 6.5. The average of the smallest and the greatest numbers among them will be: 

The average of the squares of first ten natural numbers is 

The average weight of 24 students is 35 kg. If the weight of teacher is added the average increased by 400 gram. What is the weight of the teacher?

5 number whose average is 76, the first is 3/7 times the sum of other 4. the first number is: 

The average monthly income of A and B is Rs.15,050 , and the average monthly income of B and C is Rs.15,350 and the average income of A and C is Rs.15,200. The monthly income of A is.

The average of three numbers is 40. The first number is twice the second and the second one is thrice the third number. The difference between the largest and the smallest numbers is

Find mean of first five prime number.

The average age of P, Q, R, and S is 30 years. How old is R?
I. The sum of ages of P and R is 60 years.
II. S is 10 years younger than R.