There were 24 students in a class. One of them, who was 18 years old, left the class and his place was filled up by a ne…

A batsman makes a score of 84 runs in the 21<sup>st</sup> inning and thus increases his average by 2 runs. H…

If 25a + 25b = 115, what is the average of a and b?

The average of some natural numbers is 15. If 30 is added to the first number and 5 is subtracted from the last number t…

Of the three numbers, the average of the first and the second is greater than the average of the second and the third by…

Ten years ago, the ages of the members of a joint family of eight people added up to 231 years. Three years later, one m…

A pupil's marks were wrongly entered as 83 instead of 63. Due to that the average marks for the class got increased by h…

The average age of 24 boys and their teacher is 15 years. When the teacher's age is excluded, the average age decreases …