A bookstore has 30816 exercise books which were packed in cartons. Each carton contained 24exercise books. The mass of an empty carton was 2kg and that of a full carton is 12kg. What was the total mass of books in 1 carton?

20 percentage, you can also do it on a calculator.

So the first thing we do is to multiply the top equation by 3. the reason i want to do this is i notice there will be a 6y on both equations and can possibly add/subtract them. so we get 6y = -3x + 27. adding that and the second equation we get 6x = 27-15 which is 12. divide by 6 and we get 2. ∴ x = 2. substituting 2 into the first equation we get 2y = -2 + 9 which is 7. divide by 2 and we get 7/2. ∴ y = 7/2, x = 2.