Teacher Li bought 3 footballs and gave the salesperson 70 yuan, and got 4 yuan back. How much is each football?
李老师买了3个足球给售货员70元，找回4元，每个足球多少元？
<gadget id="calculator">70 - 4</gadget>
<output>66</output>

<gadget id="calculator">66 / 3</gadget>
<output>22</output>

<result>22</result>