The average age of 40 students of class is 18 years. When 20 new students are admitted to the same class, the average ag…

The average monthly income of P and Q is Rs. 5050. The average monthly income of Q and R is Rs. 6250 and the average mon…

The average age of 30 students is 9 years. If the age of their teacher is included, the average age becomes 10 years. Th…

The average age of A, B, C, D and E is 40 years. The average age of A and B is 35 years and the average of C and D is 42…

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

The mean high temperature of the first four days of a week is 25°C whereas the mean of the last four days is 25.5&de…

The marks of six boys in a group are 48, 59, 87, 37, 78 and 57. What are the average marks of all six boys?

In a school with 600 students, the average age of the boys is 12 years and that of the girls is 11 years. If the average…