In the school group gymnastics performance, there are 280 boys and 200 girls, and 20 people stand in each row. How many rows are girls standing less than boys?
在学校团体操表演中，男生有280人，女生有200人，每行站20人，女生比男生少站多少行？
<gadget id="calculator">280 / 20</gadget>
<output>14</output>

<gadget id="calculator">200 / 20</gadget>
<output>10</output>

<gadget id="calculator">14 - 10</gadget>
<output>4</output>

<result>4</result>