A kind of steel rail, 4 pieces weigh 1600 kg in total, now there are 20000 kg steel, how many pieces of this kind of steel rail can be manufactured.
一种钢轨，4根共重1600千克，现在有20000千克钢，可以制造这种钢轨多少根．
<gadget id="calculator">1_600 / 4</gadget>
<output>400</output>

<gadget id="calculator">20_000 / 400</gadget>
<output>50</output>

<result>50</result>