Question

A hardcover book costs $8 and a paperback book costs $7. In one day, the store sold 10 books for a total of $76. How many hardcover books did they sell?

Answer 1

A hardcover book, which we shall call c, is sold for $8, while a paperback which we shall call p, is sold $7. If the store sold 10 books in one day, that means they sold

`c+p=10`

If they sold a totalof $76, that means c times $8 added to p times $7 equals a total of $76. Therefore;

`8c+7p=76`

We can now solve both equations simultaneously as follows;