The area of a classroom is about 50 square meters, how many such classrooms, the area is about 1 hectare.
一个教室的面积约50平方米，多少个这样的教室，面积约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>