A rectangular park covering an area of 2 hectares is 200 meters long and how many meters wide.
一个占地2公顷的长方形公园，长200米，宽多少米．
<gadget id="calculator">2 * 10_000</gadget>
<output>20_000</output>

<gadget id="calculator">20_000 / 200</gadget>
<output>100</output>

<result>100</result>