road has been repaired by 40%, which is exactly 28 kilometers. How long is this road in kilometers?
一条公路，已修了40%，正好是28千米．这条路全长多少千米？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">28 / (2/5)</gadget>
<output>70</output>

<result>70</result>