The bus takes 9 days to get off and 3 days to get on the bus. At this time, there are still 19 people on the bus. How many people are on the bus before arriving at the station?
公交车，下车9天，上车3天，这时车上还有19人，到站前车上有几人？
<gadget id="calculator">9 - 3</gadget>
<output>6</output>

<gadget id="calculator">6 + 19</gadget>
<output>25</output>

<result>25</result>