A train originally had 846 passengers, 226 got off at Hefei Station, and another 234 boarded. How many people were on the train at this time?
一列火车原有乘客846人，到达合肥站有226人下车，又有234人上车，这时火车上有多少人？
<gadget id="calculator">846 - 226</gadget>
<output>620</output>

<gadget id="calculator">620 + 234</gadget>
<output>854</output>

<result>854</result>