Steve has 25 socks. He has 4 pairs of socks that match, and all the others don't match. How many mismatching socks does Steve have altogether?
In each pair of socks there are 2/1 = 
<gadget id="calculator">2/1</gadget>
<output>2</output>
2 socks.
Steve has 2*4 = 
<gadget id="calculator">2*4</gadget>
<output>8</output>
8 matching socks.
Steve has 25-8 = 
<gadget id="calculator">25-8</gadget>
<output>17</output>
17 mismatching socks.

<result>17</result>