A rectangular experimental field of 0.2 hectares, its length is 80 meters, find its width.
一块0.2公顷的长方形试验田，它的长是80米，求它的宽．
<gadget id="calculator">0.2 * 10_000</gadget>
<output>2_000</output>

<gadget id="calculator">2_000 / 80</gadget>
<output>25</output>

<result>25</result>