The average of some natural numbers is 15. If 30 is added to the first number and 5 is subtracted from the last number t…

Out of 20 boys, 6 are each of 1 m 15 cm height, 8 are of 1 m 10 cm and rest of 1 m 12 cm. The average height of all of t…

A batsman makes a score of 270 runs in the 87<sup>th</sup> inning and thus increase his average by a certain…

If the average of m numbers is n<sup>2</sup> and that of n numbers is m<sup>2</sup> , then the …

The average monthly income of a family of four earning members was Rs. 15130. One of the daughters in the family got mar…

The average weight of 16 boys in a class is 50.25 kgs and that of the remaining 8 boys is 45.15 kgs. Find the average we…

If the average of 5 numbers is 10, the number which should be added to make the average 12 is-

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…