A car leaves from the terminus, and there are 20% vacant seats in the car. At station A, 12 people get off and 20 people get on the car. At this time, the seats in the car are just full. How many seats does this car have?
一辆汽车从总站开出，全车座位上有20%空位，到A站有12人下车，20人上车，这时车内的座位恰好坐满．这辆车共有多少个座位？
<gadget id="calculator">20 - 12</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>

<result>40</result>