The experimental elementary school will hold a group gymnastics performance. There are 30 people in each row, and there are 12 rows; if there are 15 rows, how many people are in each row?
实验小学要举行团体操表演，每行30人，排了12行；如果排15行，每行多少人？
<gadget id="calculator">30 / 15</gadget>
<output>2</output>

<gadget id="calculator">12 * 2</gadget>
<output>24</output>

<result>24</result>