A car owner buys petrol at Rs. 17, Rs. 19 and Rs. 20 per litre for three consecutive years. Compute the average cost per…

The mean temperature of Monday to Wednesday was 37°C and of and of Tuesday to Thursday was 34°C. If the temperat…

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 a group of persons going for picnic is 16 years. Twenty new persons with an average age of 15 years j…

The average age of a family of 10 members is 20 years. If the age of the youngest member of the family is 10 years, then…

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…

The captain of a cricket team of 11 members is 26 years old and the wicket keeper is 3 years older. If the ages of these…

The average of 12 numbers is 15 and the average of the first two is 14. What is the average of the rest ?