classroom covers an area of 50 square meters, how many such classrooms cover an area of 1 hectare.
一个教室占地面积为50平方米，多少个这样的教室占地面积是1公顷．
<gadget id="calculator">10_000 / 50</gadget>
<output>200</output>

<gadget id="calculator">1 * 200</gadget>
<output>200</output>

<result>200</result>