A parallelogram land covers an area of 28 hectares. It is known that the height of this land is 400 meters, and its bottom is in meters.
一块平行四边形地占地28公顷，已知这块地的高是400米，它的底是多少米．
<gadget id="calculator">28 * 10_000</gadget>
<output>280_000</output>

<gadget id="calculator">280_000 / 400</gadget>
<output>700</output>

<result>700</result>