On Sunday, 12 students went to visit a science and technology exhibition. They paid a total of 180 yuan for tickets, and each person spent 5 yuan for the bus. How much did each person spend on average?
星期天，12个学生去参观科技展览，共付门票180元，每人乘车用去5元，平均每人花了多少钱？
<gadget id="calculator">180 / 12</gadget>
<output>15</output>

<gadget id="calculator">15 + 5</gadget>
<output>20</output>

<result>20</result>