There are 6 empty seats on a bus. The car drove to Tuanjie Station, no one got off the car, but 9 people came up, and there were 2 empty seats. How many people got on the car and stood?
一辆公共汽车上有6个空座位．车开到团结站，没有人下车，但上来了9人，空座位还有2个，上车的人中有多少人站着．
<gadget id="calculator">6 - 2</gadget>
<output>4</output>

<gadget id="calculator">9 - 4</gadget>
<output>5</output>

<result>5</result>