Melanie had 255 dollars to spend on 8 books. After buying them she had 15 dollars. How much did each book cost?
2 answers:
1. She starts with $255.
2. She purchases 8 books for an unknown cost per book, so she spends 8 * (unknown cost per book).
3. She is left with $15.
Let's set up an equation:
Now, we solve. First, we'll subtract 255 from each side:
Now, we'll divide through by -8:
The cost per book is $30. Let's check it out:
$30/book * 8 books = $240
She started with $255 and spent $240, which leaves her with $15. Exactly what the original question indicated. We're done. (Those are some expensive books.)
2. She purchases 8 books for an unknown cost per book, so she spends 8 * (unknown cost per book).
3. She is left with $15.
Let's set up an equation:
Now, we solve. First, we'll subtract 255 from each side:
Now, we'll divide through by -8:
The cost per book is $30. Let's check it out:
$30/book * 8 books = $240
She started with $255 and spent $240, which leaves her with $15. Exactly what the original question indicated. We're done. (Those are some expensive books.)
You might be interested in