Students do exercises, 24 people stand in each row, exactly 15 rows. If there are 30 people standing in each row, how many rows can they stand in?
同学们做操，每行站24人，正好站15行．如果每行站30人，可以站多少行．
<gadget id="calculator">15 / 30</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">24 * (1/2)</gadget>
<output>12</output>

<result>12</result>