A large-scale group gymnastics performance is held at the opening ceremony of the school sports meeting. There are 15 rows at the beginning, 12 people in each row, and 9 rows in each row after the change. How many people are there in each row?
在学校运动会开幕式上进行大型团体操表演，开始有15行，每行12人，变阵后每行有9行，这时每行有多少人？
<gadget id="calculator">12 / 9</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">15 * (4/3)</gadget>
<output>20</output>

<result>20</result>