List of top Mathematics Questions on Averages

The arithmetic mean of \(1,2,3,\ldots,n\) is:

The average of 5 numbers is 27. If one number is excluded, the average becomes 25. The excluded number is:

The average age of 15 students is 18 years. If the teacher's age is added, the average increases by 1 year. What is the teacher's age?

A batsman has a certain average of runs for 11 innings. In the 12\(^{\text{th}}\) inning. He makes a score of 90 runs, thereby increasing his average by 5. His new average is: