The average of 80 boys in a class is 15. The average age of a group of 15 boys in the class is 16 and the average age of…

Distance between two stations A and B is 778km. A train covers the journey from A to B at 84km per hour and returns back…

The average weight of 15 students in a class increases by 1.5 kg when one of the students weighing 40 kg is replaced by …

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 age of 20 boys in a class is 12 years. 5 new boys are admitted to the class whose average age is 7 years. Th…

Average age of ten persons learning yoga is 32 years. When the age of their instructor is added, the average age becomes…

A batsman makes a score of 87 runs in the 17<sup>th</sup> inning and thus increases his average by 3. Find h…

In Arun's opinion, his weight is greater than 65 kg but less than 72 kg. His brother doest not agree with Arun and he th…