Of four numbers whose average is 60, the first is one-fourth of the sum of the last three. The first…

The average of 7 consecutive numbers is 20. The largest of these numbers is- A. 20 B. 22 C. 23…

The average mark of student in 4 subjects is 75. If the student obtained 80 marks in the fifth subject,…

The average annual income (in Rs.) of certain agricultural workers is S and that of other workers is T. The…

In a class there are 32 boys and 28 girls. The average age of the boys in the class is…

The mean of 5 observations is 60, the mean of 10 observations is 30 and the mean of 15 observations…

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

The average price of three items of furniture is Rs. 15000. If their prices are in the ratio 3 :…

Out of three numbers, the first is twice the second and is half of the third. If the average of…

The average of 50 numbers is 38. If the numbers 45 and 55 are discarded, then the average of the…