Students are doing exercises on the playground. There are 12 people in each row, and 20 rows can be arranged. If there are 30 people in each row, how many rows can be arranged?
同学们在操场上做操，每行12人，可排20行，如果每行排30人，可排多少行？
<gadget id="calculator">12 * 20</gadget>
<output>240</output>

<gadget id="calculator">240 / 30</gadget>
<output>8</output>

<result>8</result>