In a family of 5 members, the average age at present is 33 years. The youngest member is 9 years old. The average age of…

The mean of 20 items is 55. If two items 45 and 30 are removed, the new mean of the remaining items is :

The average of two numbers is XY. If one number is X, the other is-

A family consists of two grandparents, two parents and three grandchildren. The average age of the grandparents is 67 ye…

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

The batting average for 40 innings of a cricket player is 50 runs. His highest score exceeds his lowest score by 172 run…

Mean of 10 numbers is 30. Later on it was observed that numbers 15, 23 are wrongly taken as 51, 32. The correct mean is …

In 2011, the arithmetic mean of the annual incomes of Ramesh and Suresh was Rs. 3800. The arithmetic mean of the annual …