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In a class of a certain number of students, if a student weighing 60 kg joins, the average weight increases by 2 kg . If another student weighing 60 kg joins, the average increases by 3.5 kg over the original average. What was the original average weight of the class?

In a digital learning centre, there are three types of online tests. The average score of a student in the first and second test is 84 . The average score in the second and third test is 82 . The average of the first and third test is 80 . If the student scored 4 marks less in the third test than in the first, find the marks obtained in the second test.

The average of the squares of the first 8 natural numbers is B. If each number is doubled first, and then squared, what is the new average?

A bookstore bought 150 different novels at an average price of ₹160. It sold 50 novels at a $25\%$ profit, 70 novels at a $10\%$ loss, and the remaining novels in a combo deal that included a 20% profit on the total cost of the remaining novels. What was the selling price per novel in the combo deal?

'P', 'Q', 'R' and 'S' have different amounts. ' $Q$ ' has 3.5 times the amount ' $P$ ' has. ' S ' has $50\%$ less than ' Q '. The amount R is equal to the average of those three persons. If the sum of amounts 'P' and 'R' is Rs. 6000 , find the amount 'R' has.

The average outer diameter of a traditional bamboo flute used in Indian folk and classical music is approximately: