To build a road, 40% of it has been repaired, and there are still 3 kilometers left. How many kilometers is this road in total?
修一条路，已经修了它的40%，还剩3千米，这条路共有多少千米？
<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">3 / (3/5)</gadget>
<output>5</output>

<result>5</result>