An engineering team has repaired a 20-kilometer-long road, and 20% of it has been repaired. How many kilometers are left to be repaired?
某工程队修一条长20千米的公路，已经修了20%，还剩多少千米没有修？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">20 * (4/5)</gadget>
<output>16</output>

<result>16</result>