Students do morning exercises, 24 people stand in each row, exactly 15 rows. If there are 20 people standing in each row, how many rows should they stand?
同学们做早操，每行站24人，正好站成15行．如果每行站20人，要站多少行？
<gadget id="calculator">15 / 20</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">24 * (3/4)</gadget>
<output>18</output>

<result>18</result>