James buys 3 packs of candy.  He pays with a $20 bill and gets $11 change.  How much did each pack of candy cost?
The candy cost 20-11=$
<gadget id="calculator">20-11</gadget>
<output>9</output>
9.
So he pays 9/3=$
<gadget id="calculator">9/3</gadget>
<output>3</output>
3 per candy.

<result>3</result>