If the average weight of 10 students is 25 kg and that of other 10 students is 35 kg, then the average weight of these 20 students is:

The median of the observations: 12, 59, 14, 46, 18, 42, 26, 33, 22 is:

The average marks of the students of a class are 55. What is the number of students in the class if the sum total of marks of all the students in the class is 3575 ?

If the median of x/5, x/4, x/2, x and x/3, where x > 0, is 8, find the value of x.

The average of the four consecutive odd number is 16. What is the difference between third and first number?

Find the average of following numbers.

12, 15, 18, 14, 16, 13, 25, 28, 23, 27

The average of 3 odd consecutive numbers is 15. What is the sum of first and last numbers?