Final answer:
Ofelia originally had $15.
Step-by-step explanation:
Mathematics: Middle School Level
To solve this problem, we can set up an equation to represent the relationship between Ofelia's original amount of money and the amount she has left after spending $12. Let's call Ofelia's original amount of money 'x'. After spending $12, she has (1/5) of her original amount left, which can be represented as (1/5)x. We can set up the equation:
x - 12 = (1/5)x
To solve for x, we can multiply both sides of the equation by 5 to get rid of the fraction:
5(x - 12) = x
5x - 60 = x
4x = 60
x = 60/4
x = 15
Therefore, Ofelia originally had $15.