There were 850 people on a train from Shanghai to Beijing, 225 people got off at Jiji South Station, and another 503 people got on the train. How many people were there in the car at this time?
一列火车从上海开往北京，车上有850人，途经济南站225人下车，又有503人上车．这时车内一共有多少人？
<gadget id="calculator">850 - 225</gadget>
<output>625</output>

<gadget id="calculator">625 + 503</gadget>
<output>1_128</output>

<result>1_128</result>