A passenger car was driving from Shuanglin to Huzhou. There were no empty seats when driving. (1/4) passengers got off at Chongzhao Station, and 2 people got on the bus. At this time, the number of people in the car was the same as when driving (4/5) , how many people are in the car while driving?
一辆客车从双林开往湖州，开车时座无虚席，到重兆站有(1/4)的乘客下车，有2人上车，这时车内的人数是开车时的(4/5)，开车时车内有多少人？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(4/5) - (3/4)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">2 / (1/20)</gadget>
<output>40</output>

<result>40</result>