Fill in the blanks. Bus No. 101 is going from Zhongyang Modern City to Baidian. There are 2 empty seats on the bus. On the way, it passes through Shuanglou Town. 20% of the passengers get off the bus. At this time, another 10 people get on the bus, and the seats are just right. Full. How many passenger seats are there in the car?
填空题．公交车101路汽车从中洋现代城去白甸，出发时车上有2个空座位，途中经过双楼镇，车上有20%的乘客下车，这时又上车10人，座位正好坐满．车上乘客座位有多少个．
<gadget id="calculator">10 - 2</gadget>
<output>8</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">8 / (1/5)</gadget>
<output>40</output>

<gadget id="calculator">40 + 2</gadget>
<output>42</output>

<result>42</result>