The school bought 13 footballs, paid the salesperson 600 yuan, and got back 80 yuan. How much is each football?
学校买了13个足球，付给营业员600元，找回80元，每个足球多少元？
<gadget id="calculator">600 - 80</gadget>
<output>520</output>

<gadget id="calculator">520 / 13</gadget>
<output>40</output>

<result>40</result>