Average Mock Tests

The average age of 20 students in a class is 21 years. If the teacher's age is included, the average increases by 1 year. What is the age of the teacher?

The average of 11 results is 50. If the average of the first 6 results is 49 and that of the last 6 is 52, find the sixth result.

The average weight of 8 persons increases by 2.5 kg when a new person comes in place of one of them weighing 50 kg. What is the weight of the new person?

The average of 20 numbers is 35. If one number is excluded, the average becomes 32. What is the excluded number?

The average of 15 numbers is 40. If each number is multiplied by 3, what is the new average?

The average of first 50 natural numbers is:

The average age of 40 students in a class is 15 years. If the teacher age is also included, the average increases by 1 year. The age of the teacher is:

The mean of 15, 25, 35, 45 and 55 is: