Xiao Liang sat on a tour bus on the circular track, and he found that there were 6 cars in front of him and 6 cars behind him. Excuse me: How many cars are there on the track?
小亮坐在环行跑道上的一辆游览车上，他发现他前面有6辆车，后面也有6辆车．请问：跑道上有几辆车？
<gadget id="calculator">6 + 1</gadget>
<output>7</output>

<result>7</result>