While on vacation, Nancy took 49 pictures at the zoo and 8 at the museum. If she later deleted 38 of the pictures, how many pictures from her vacation did she still have?
<gadget id="calculator">49 + 8</gadget>
<output>57</output>

<gadget id="calculator">57 - 38</gadget>
<output>19</output>

<result>19</result>