A car leaves from the terminus, and (1/6) of the seats in the car are empty. After arriving at station A, 12 people get off and 20 people get on the car. This means that the car is just full of passengers. How many seats does this car have.
一辆汽车从总站开出，车上有(1/6)的座位空着，到A站后有12人下车，20人上车，这是车内恰好坐满乘客．这辆车有多少个座位．
<gadget id="calculator">20 - 12</gadget>
<output>8</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">8 / (1/6)</gadget>
<output>48</output>

<result>48</result>