In the broadcasting exercise competition, the third grade students stand 20 people in each row, exactly 18 rows. If there are 24 people standing in each row, how many rows can they stand in?
广播操比赛，三年级学生每行站20人，正好站18行．如果每行站24人，可以站多少行？
<gadget id="calculator">18 / 24</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">20 * (3/4)</gadget>
<output>15</output>

<result>15</result>