List of top Mathematics Questions on Averages asked in MAH MBA CET

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: