If shirts at a garage sale cost $0.75 each, how many shirts can Abby buy for $15?

To determine how many shirts Abby can buy for $15 when each shirt costs $0.75, you can use a simple division calculation.

Start by dividing the total amount of money Abby has ($15) by the cost of one shirt ($0.75). The calculation looks like this:

15 ÷ 0.75 = 20

This means that Abby can purchase 20 shirts with her $15. The calculation shows how the total cost for multiple shirts adds up, and by finding the quotient, you determine how many units (shirts) can be bought with the given budget.

This reasoning confirms that Abby can indeed buy 20 shirts for the amount she has, making this choice the correct answer.