Students do exercises, 20 people stand in each row, exactly 18 rows. If there are 24 people standing in each row, how many rows can they stand in?
同学们做操，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>