Question

Marina spent 1/5 of her money on a book. If she had $80 left after she brought the book, how much money did she have originally?

Answer 1

Marina had 50$ originally

Explanation:

80-1/5 of the money she spent for the books that she brought, The step by step process is how much money she had left behind from the books she brought seperate

Answer 2

$100

Explanation:

Step 1, setting up an equation:

If Marina spent
`(1)/(5)` of her money, she has
`(4)/(5)` of her money remaining. We also are given that she has $80 left. We can set her initial total amount of money as x to solve this problem:

`(4)/(5)x=80`

Step 2, solving for x:

`(4)/(5)x=80\\\\4x=400\\\\x=100`

We have set x as her original amount of money, so we have the answer!

Marina originally had
`\fbox{100}` dollars.

I hope this helps! Let me know if you have any questions :)