Students practice group gymnastics, with 20 people in each row, and they can stand in 15 rows. If there are 5 more people standing in each row, how many rows should we stand?
同学们练团体操，每行20人，可站15行．如果每行多站5人，看站多少行？
<gadget id="calculator">20 + 5</gadget>
<output>25</output>

<gadget id="calculator">15 / 25</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">20 * (3/5)</gadget>
<output>12</output>

<result>12</result>