There were originally 50 passengers on the No. 16 bus. After the bus arrived at the station, some people got off and seven people got on the bus. At this time, there were 23 fewer people on the bus than before. Ask how many people get off?
16路公共汽车上原有乘客50名，车到站后有一些人下车，又有7人上车，这时车上比原来少23人．问有多少人下车？
<gadget id="calculator">23 + 7</gadget>
<output>30</output>

<result>30</result>