Shelby had $20 to take to the book fair. She bought one book for $8 and another for $4. She decided to buy as many $4 posters as she could with the money she had left. How many posters can she buy? Let's think first. Chain of thought:
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She spent $8 + $4 = $12 on books. She started with $20, so she has $20 - $12 = $8 left to spend on posters. Each poster costs $4, so she can buy $8 / $4 = 2 posters.
Therefore, the answer is 2.
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