The average height of 30 boys out of a class of 50 is 160 cm. If the average height of the remaining boys is 165 cm, the…

Average of two numbers is 8 and average of other three numbers is 3; the average of the five numbers is :

A batsman in his 12<sup>th</sup> innings makes a score of 63 runs and there by increases his average score b…

If the average of x and $$\frac{1}{x}$$ (x $$ \ne $$ 0) is M, then the average of x<sup>2</sup> and $$\frac…

The average of six numbers is 20. If one number is removed, the average becomes 15. What is the number removed ?

The average age of four boys A, B, C and D is 5 years and the average age A, B, D, E is 6 years. C is 8 years old. The a…

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 40 students of class is 18 years. When 20 new students are admitted to the same class, the average ag…