The school organizes a group dance performance on campus. If there are 24 people in each row, you need to line up in 20 rows. If you stand in each row with 16 people, how many rows should you line up? (Solved with proportional knowledge)
学校组织校园集体舞表演，如果每行站24人，要排20行，如果每行站16人，要排多少行？(用比例知识解决)
<gadget id="calculator">24 * 20</gadget>
<output>480</output>

<gadget id="calculator">480 / 16</gadget>
<output>30</output>

<result>30</result>