On Sunday, 4 students went to visit a science and technology exhibition. They paid a total of 80 yuan for the ticket, and 4 yuan for each person to take the bus. How much did each person spend on average?
星期天，4名学生去参观科技展览，共付门票80元，每人乘车用4元．平均每人花了多少钱？
<gadget id="calculator">80 / 4</gadget>
<output>20</output>

<gadget id="calculator">20 + 4</gadget>
<output>24</output>

<result>24</result>