The area of a classroom is about 50 square meters, and the area of 200,000 square meters is roughly equivalent to how many such classrooms.
一间教室的面积大约是50平方米，20万平方米的面积大约相当于多少个间这样的教室．
<gadget id="calculator">20 * 10_000</gadget>
<output>200_000</output>

<gadget id="calculator">200_000 / 50</gadget>
<output>4_000</output>

<result>4_000</result>