Cuiwei Primary School conducts a group performance. If there are 20 people in each row, 18 rows should be arranged. If there are 15 people in each row, how many rows should be arranged? (Solve with ratio)
翠微小学进行团体表演，如果每行20人，要排18行，如果每行15人，要排多少行？(用比例解)
<gadget id="calculator">20 * 18</gadget>
<output>360</output>

<gadget id="calculator">360 / 15</gadget>
<output>24</output>

<result>24</result>