There are 54 passengers on a bus, which leaves from the starting point. When it reaches the first stop, 8 people get off and 2 get on the bus; when it reaches the second stop, 9 people get off and 3 get on the bus; At the third stop, 5 people got off and 3 got on. Children, do you know how many passengers are still in the car at this time.
一辆公共汽车上有54名乘客，从起点站开出，到达第一站时，有8人下车，2人上车；到第二站时，有9人下车，3人上车；到第三站时，有5人下车，3人上车．小朋友们，你知道这个时候车上还有多少乘客．
<gadget id="calculator">3 - 8 - 9 - 5</gadget>
<output>-19</output>

<gadget id="calculator">54 + 2 + 3 + (-19)</gadget>
<output>40</output>

<result>40</result>