The average age of a family with 5 members is 28. If one of the 5 members of age 20 is excluded the average age of the f…

Out of 10 teachers of a school, on teacher retires and in place of him a new teacher 25 years old joins. As a result of …

The average of a group of men is increased by 5 years when a person aged of 18 years is replaced by a new person of aged…

A coaching institute has students in 3 batches – X, Y and Z. In a certain examination, the average marks obtained …

In a class with a certain number of students, if one student weighting 50 kg is added then the average weight of the cla…

The average of x<sub>1</sub>, x<sub>2</sub>, x<sub>3</sub> and x<sub>4</su…

The arithmetic mean of the following numbers : 1, 2, 2, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6 and 7, 7, 7…

The speed of the train going from Nagpur to Allahabad is 100 km/h while when coming back from Allahabad to Nagpur, its s…