A car departs from Yanqing Station and arrives at Balidian Station. (2/5) passengers get off, and then 8 people get on. At this time, the ratio of the number of passengers on the car to the total number of people on the original car is 4:5. What was the total number of people in the car?
一辆汽车从延庆站出发，到八里店站后，有(2/5)的乘客下车，然后又上来8人，这时车上乘客人数与原来车上总人数的比是4：5，原来车上的总人数是多少？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(4/5) - (3/5)</gadget>
<output>1/5 = around 0.2</output>

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

<result>40</result>