The school holds a gymnastics competition performance. If there are 18 people in each row, you need to stand in 20 rows. If you have 15 people in each row, how many rows should you stand in? (Solve with ratio)
学校举行体操比赛表演，如果每行18人，要站20行，如果每行15人，要站多少行？(用比例解)
<gadget id="calculator">18 * 20</gadget>
<output>360</output>

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

<result>24</result>