Teacher Li took 100 yuan to buy 3 footballs, and there is 7 yuan left. How much is each football?
李老师拿了100元钱买了3个足球，还剩7元，每个足球多少钱？
<gadget id="calculator">100 - 7</gadget>
<output>93</output>

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

<result>31</result>