To build a 2000-meter-long road, it was built on the first day (2/5), and the remaining meters were not repaired.
修一条2000米长的路，第一天修了(2/5)，剩下多少米没有修．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">2_000 * (2/5)</gadget>
<output>800</output>

<gadget id="calculator">2_000 - 800</gadget>
<output>1_200</output>

<result>1_200</result>