The sports interest group bought 3 small footballs, paid 100 yuan to the salesperson, and got 7 yuan back. How much is each small football?
体育兴趣小组买了3个小足球，付给营业员100元，找回7元，每个小足球多少元？
<gadget id="calculator">100 - 7</gadget>
<output>93</output>

<gadget id="calculator">93 / 3</gadget>
<output>31</output>

<result>31</result>