In a class, there are 40 boys and their average age is 16 years. One boy, aged 17 years, leaving the class and another j…

The average expenditure of a man for the first five months of a year is Rs. 5000 and for the next seven months it is Rs.…

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 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 weight of 21 boys was recorded as 64 kg. If the weight of the teacher was added, the average increased by 1 …

A school has 4 sections of chemistry in Class X having 40, 35, 45 and 42 students. The mean marks obtained in Chemistry …

In an exam, the average marks obtained by Jhon in English, Math, Hindi and Drawing were 50. His average mark in Maths, S…

The average age of mother and her six children is 12 years, which is reduced by 5 years if the age of mother is excluded…