The road construction team wants to build a 500-kilometer road, and 40% of it has been repaired. How many kilometers are left to be completed?
修路队要修一条长500千米的公路，已经修了40%，还剩多少千米没有修完？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">500 * (3/5)</gadget>
<output>300</output>

<result>300</result>