Question

Tony spent $100 on books to give away as prizes to his students. At the store, he bought 4 more books than planned, spending $5 per book. Which equation can be used to find the number of books he originally wanted to buy. X

Answer 1

`5x=100`

`x=20\ books`

Explanation:

I'm going to assume that all books cost the same.

Let

x ------> the number of books he originally wanted to buy

we know that

`(x+4)(5)=100+4(5)`

`5x+20=100+20`

`5x=100` -----> equation that can be used to find the number of books he originally wanted to buy

solve for x

`x=100/5`

`x=20\ books`