Wang Xiaoli bought 4 boxes of beverages at the supermarket, paid the salesperson 80 yuan, and got 4 yuan back. How much is each box of beverages?
王小丽到超市买了4箱饮料，付给营业员80元，找回4元，每箱饮料多少元？
<gadget id="calculator">80 - 4</gadget>
<output>76</output>

<gadget id="calculator">76 / 4</gadget>
<output>19</output>

<result>19</result>