Facts:
Maya spent 1/5 or 20% of her money on a book
She has $80 left over
So that means she has 4/5 of her money left over
First, divide the numerator by the denominator which is 4 divided by 5 which equals .80
Then you get that and divide $80 by .80 which is $100
So that means that she originally had $100 but spent $20 which leaves her with $80
Answer: Maya originally had $100
