A road has been repaired (2/5), and it is 400 meters long. How many meters are left?
一条路，已修了(2/5)，是400米，还剩多少米？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">400 / (2/5)</gadget>
<output>1_000</output>

<gadget id="calculator">1_000 - 400</gadget>
<output>600</output>

<result>600</result>