A bus departs from the station, and the seats on the bus are just full of people. When it arrives at station A, 19 people get off and 12 people get on the bus. At this time, (1/5) of the seats are vacant on the bus. How many seats are there in total in this car?
一辆客车从车站出发，全车座位刚好坐满了人，到甲站是有19人下车，12人上车，这时车上空出了(1/5)的座位．这辆车上共有多少个座位？
<gadget id="calculator">19 - 12</gadget>
<output>7</output>

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

<gadget id="calculator">7 / (1/5)</gadget>
<output>35</output>

<result>35</result>