The engineering team has built a road, which has been repaired (3/5), and there are still 20 kilometers left to be repaired. How long is this road in meters?
工程队修一条公路，已经修了(3/5)，还剩20千米没有修．这条公路全长是多少米？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">20 / (2/5)</gadget>
<output>50</output>

<gadget id="calculator">50 * 1_000</gadget>
<output>50_000</output>

<result>50_000</result>