45% of a project has been completed, and how much is left unfinished.
一项工程，完成了45%，还剩多少没有完成．
<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>