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…

If the average marks of three batches of 55, 60 and 45 students respectively is 50, 55, 60, then the average marks of al…

Total expenses of a boarding house are partly fixed and partly varying linearly with the number of boarders. The average…

There are two sections A and B of a class, consisting of 36 and 44 students respectively. If the average weight of secti…

The average age of 30 students in a class is 15 years. If 6 students of this class have the average age of 16 years, the…

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

The average of the squares of first ten natural numbers is-

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