You are given an initial state: 'A baker has 12 croissants ready for sale.' Write a single sentence describing an event that would require a subtraction operation to find the new number of croissants. Then, write the mathematical expression for this operation.

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Following the establishment of the initial quantity of apples, the first action in the problem is that Jack eats 2 of them. This event is represented by a subtraction operation from the starting total, leaving him with 5 apples (7 - 2).

First Reasoning Step for the Apple Problem: Eating Apples

In the second step of the problem, Jack receives 5 more apples from his mother. This is an addition operation, increasing his total from 5 to 10 apples (5 + 5).

Second Reasoning Step for the Apple Problem: Receiving More Apples

A librarian starts the day with 15 books on a display shelf. During the morning, 6 of these books are checked out by patrons. Which calculation correctly represents how to find the number of books remaining on the shelf?

Based on the information provided in the scenario, determine the number of bestseller copies remaining at the bookstore at noon. Explain the single mathematical operation you used to arrive at your answer.

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