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

The average age of a family with 5 members is 28. If one of the 5 members of age 20 is excluded the average age of the f…

There were 35 students in a hostel. If the number of the students is increased by 7, then the expenses of the mess incre…

The average marks in Science subject of a class of 20 students is 68. If the marks of two students were misread as 48 an…

Five years ago the average age of A, B, C, D was 45 years. By including X the present average of all the five is 49 year…

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 man spends his three months income in four month time. If his monthly income is Rs. 1000 then his annual savings is ?

If 25a + 25b = 115, what is the average of a and b?