A nursery has an area of 8 hectares. Its length is 4000 meters, what is its width in meters?
某苗圃的面积是8公顷．它的长是4000米，宽是多少米．
<gadget id="calculator">8 * 10_000</gadget>
<output>80_000</output>

<gadget id="calculator">80_000 / 4_000</gadget>
<output>20</output>

<result>20</result>