The average age of an adult class is 40 years. 12 new students with an average age of 32 years join the class, thereby d…

The average price of 10 books is Rs. 12 while the average price of 8 of these books is Rs. 11.75. Of the remaining two b…

In a class with a certain number of students, if one student weighting 50 kg is added then the average weight of the cla…

Eight consecutive numbers are given. If the average of the two numbers that appear in the middle is 6, then the sum of t…

The average of some natural numbers is 15. If 30 is added to the first number and 5 is subtracted from the last number t…

The average age of seven boys sitting in a row facing North is 26 years. If the average age of the first three boys is 1…

The average of the first 100 positive integers is -

A student finds the average of ten 2 digits numbers. While copying numbers, by mistake, he writes in number with its dig…