The school holds a group gymnastics performance. If there are 25 people in each row, 24 rows should be arranged. If 5 people are reduced in each row, how many rows should be arranged? (Solve with ratio)
学校举行团体操表演，如果每列25人，要排24列，如果每列减少5人，要排多少列？(用比例解)
<gadget id="calculator">25 * 24</gadget>
<output>600</output>

<gadget id="calculator">25 - 5</gadget>
<output>20</output>

<gadget id="calculator">600 / 20</gadget>
<output>30</output>

<result>30</result>