Students do exercises, 24 people stand in each row, exactly 30 rows. If there are 20 people standing in each row, how many rows can they stand? (Answer with proportional knowledge)
同学们做操，每行站24人，正好30行．如果每行站20人，可以站几行？(用比例知识解答)
<gadget id="calculator">24 * 30</gadget>
<output>720</output>

<gadget id="calculator">720 / 20</gadget>
<output>36</output>

<result>36</result>