There were 46 passengers on the bus, 19 got off after arriving at the station, and 15 got on again. How many people are in the car now?
车上有乘客46人，到站后下车了19人，又上来了15人．现在车上有多少人？
<gadget id="calculator">46 - 19</gadget>
<output>27</output>

<gadget id="calculator">27 + 15</gadget>
<output>42</output>

<result>42</result>