The average of marks in Mathematics for 5 students was found to do 50. Later, it was discovered that in the case of one …

The average age of all the students of a class is 18 years. The average age of boys of the class is 20 years and that of…

Ajit has a certain average for 9 innings. In the tenth innings, he scores 100 runs thereby increasing his average by 8 r…

The average of two numbers is XY. If one number is X, the other is-

The average monthly salary of 12 workers and 3 managers in a factory was Rs. 600. When one of the manager whose salary w…

The mean of 100 observations was calculated as 40. It was founder later on that one of the observation was misread as 83…

The average of 6 observations is 45.5. If one new observation is added to the previous observations, then the new averag…

The average age of 30 students is 9 years. If the age of their teacher is included, the average age becomes 10 years. Th…