A fruit seller sold big, medium and small sizes apples of Rs. 15, Rs. 10 and Rs. 5, respectively. The total number of ap…

The present age of a father is 3 years more than three times the age of his son. Three years hence, father's age will be…

A student finds the average of 10 positive integers. Each integer contains two digits. By mistake, the boy interchanges …

The average score of a class of boys and girls in an examination is A. The ratio of boys and girls in the class is 3 : 1…

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…

The average age of husband, wife and their child 3 years ago was 27 years and that of wife and the child 5 years ago was…

One-fourth of certain journey is covered at the rate of 25 km/h, one-third at the rate of 30 km/h and the rest at 50 km/…

The average of nine number is 50. The average of first five numbers is 54 and that of the last three numbers is 52. Then…