The third grade students do exercises, if there are 12 people in each row, they can stand in 20 rows; if there are 8 people in each row, how many rows can they stand in?
三年级同学做操，如果每排站12人，可以站20排；如果每排站8人，可以站几排？
<gadget id="calculator">12 * 20</gadget>
<output>240</output>

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

<result>30</result>