3 years ago the average of a family of 5 members was 17 years. A baby having been born, the average age of the family is…

The mean of 100 observations was calculated as 40. It was founder later on that one of the observation was misread as 83…

There are five boxes in cargo hold. The weight of the first box is 200 kg and the weight of the second box is 20% higher…

The average age of all the students of a class is 18 years. The average age of boys of the class is 20 years and that of…

The average marks of four subjects is 120. If 33 was misread as 13 during the calculation, what will be the correct aver…

The average age of group of 20 girls is 15 years and that of another group of 25 boys it is 24 years. The average age o…

If a, b, c, d, e are five consecutive odd numbers, their average is

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