Mom buys 3 footballs for 100 yuan, and the aunt gives mom 7 yuan. How much is each football?
妈妈用100元买3个足球，阿姨找给妈妈7元，每个足球多少元？
<gadget id="calculator">100 - 7</gadget>
<output>93</output>

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

<result>31</result>