Dongfang primary school students line up to do exercises. If there are 20 people standing in each row, it is exactly 50 rows. If there are 25 people standing in each row, how many rows should be stood? (answer with ratio)
东方小学学生排队做操．如果每行站20人，刚好站50行．如果每行站25人，要站多少行？(用比例解答)
<gadget id="calculator">20 * 50</gadget>
<output>1_000</output>

<gadget id="calculator">1_000 / 25</gadget>
<output>40</output>

<result>40</result>