After a train got off at Shanghai Station with 600 people, 750 people boarded again. At this time, there were 1085 passengers on the train. How many passengers are there before the train boards at Shanghai Station?
一列火车在上海站下车600人后，又上车750人，此时车上有乘客1085人，这列火车上到上海站前有乘客多少人？
<gadget id="calculator">1_085 - 750</gadget>
<output>335</output>

<gadget id="calculator">335 + 600</gadget>
<output>935</output>

<result>935</result>