There were originally 311 people on a train, but 91 people got off at Station 1, and 70 people got on. How many people are on the train now?
一列火车上原来有311人，到1号站时下去91人，上了70人，现在火车上有多少人？
<gadget id="calculator">311 - 91</gadget>
<output>220</output>

<gadget id="calculator">220 + 70</gadget>
<output>290</output>

<result>290</result>