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?
She spent $8 + $4 = $
<gadget id="calculator">8+4</gadget>
<output>12</output>
12 on books.
She started with $20, so she has $20 - $12 = $
<gadget id="calculator">20-12</gadget>
<output>8</output>
8 left to spend on posters.
Each poster costs $4, so she can buy $8 / $4 = 
<gadget id="calculator">8/4</gadget>
<output>2</output>
2 posters.

<result>2</result>