The school organized 545 teachers and students to visit the Expo site, with an average of 40 teachers and students in each car, and 12 cars have been driven away. How many teachers and students are still waiting for the bus?
学校组织545个师生到世博园区参观，平均每辆车坐40个师生，已经开走了12辆车，现在还有多少个师生在等车？
<gadget id="calculator">40 * 12</gadget>
<output>480</output>

<gadget id="calculator">545 - 480</gadget>
<output>65</output>

<result>65</result>