A bus, when driving, 31 people get on the bus, when it arrives at the stop, 19 people get off, and 26 people get on again, how many people are on the bus now?
一辆公共汽车，开车时车时上来31人，到站时，下去19人，又上来26人，现在车上有多少人？
<gadget id="calculator">31 - 19</gadget>
<output>12</output>

<gadget id="calculator">12 + 26</gadget>
<output>38</output>

<result>38</result>