Austin has 10 pairs of dress shoes he needs to polish over the weekend.  If he has polished 45% of individual shoes, how many more shoes does he need to polish?
He has 10 pairs of shoes and each pair is made of 2 individual shoes for a total of 10*2 = 
<gadget id="calculator">10*2</gadget>
<output>20</output>
20 shoes.
He has already polished 45% of the 20 individual shoes so he has polished .45*20 = 
<gadget id="calculator">45*.01*20</gadget>
<output>9</output>
9 shoes.
He has 20 shoes and has already polished 9 shoes so he has 20-9 = 
<gadget id="calculator">20-9</gadget>
<output>11</output>
11 more shoes to polish.

<result>11</result>