The road construction team has built a road, 4.5 kilometers have been repaired, and 55% of it has not been repaired. How many kilometers is this road?
修路队修一条路，已经修了4.5千米，还剩下55%没有修，这条路长多少千米？
<gadget id="calculator">55 / 100</gadget>
<output>11/20 = around 0.55</output>

<gadget id="calculator">1 - (11/20)</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">4.5 / (9/20)</gadget>
<output>10</output>

<result>10</result>