Question

A girl bought a total of 12 fiction and non-fiction books. The fiction books cost $12 each and the non-fiction books cost $25 each. If she paid $248 altogether, how many of each kind of book did she buy? How do I write that as an expression?

Answer 1

You could try to write it as 12x + 25x because we don’t know how many books she’s buying of each. Therefore, we will have to be multiplying by how many books she bought of each (x).