To find the original price of each apple, we need to determine the price per apple before any discounts. Eve bought 12 apples for $15, which means the average price per apple with the discount applied is \( \frac{15}{12} \).
Since there is a 25 cent discount applied for every 4 apples purchased, we need to account for that discount when determining the original price per apple.
Therefore, the operation done first in this scenario would be:
divide 15 by 12
This will give us the price per apple after the discount. Once we find that, we can then add the 0.25 discount back to find the original price per apple.
So, the correct answer is: divide 15 by 12.