A train departs from station A with 846 people on board, 311 people get off at station B, and 229 people get on at the same time, how many people are on the train at this time?
一列火车从甲站开出，车上有846人，到乙站下去了311人，同时还上来了229人，请问，此时火车上有多少人呢？
<gadget id="calculator">846 - 311</gadget>
<output>535</output>

<gadget id="calculator">535 + 229</gadget>
<output>764</output>

<result>764</result>