The students are performing group gymnastics. There are 15 people standing in each row, exactly 20 rows. If it is required to stand in 30 rows, how many people need to stand in each row?
同学们进行团体操表演，每行站15人，正好站20行，如果要求站30行，每行需要站多少人？
<gadget id="calculator">20 / 30</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">15 * (2/3)</gadget>
<output>10</output>

<result>10</result>