In the fourth grade, there are 200 boys and 140 girls, and 20 people stand in each row. How many rows are girls standing less than boys? What is the correct column
四年级有男生200人，女生140人，每行站20人，女生比男生少站多少行？正确列式是多少
<gadget id="calculator">200 / 20</gadget>
<output>10</output>

<gadget id="calculator">140 / 20</gadget>
<output>7</output>

<gadget id="calculator">10 - 7</gadget>
<output>3</output>

<result>3</result>