For a section of highway, 45% of the total length has been repaired, how much of the total length has not been repaired.
一段公路，已经修完了全长的45%，未修的占全长的多少．
<gadget id="calculator">45 / 100</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">1 - (9/20)</gadget>
<output>11/20 = around 0.55</output>

<result>11/20 = around 0.55</result>