There used to be 38 people in a bus, but 7 more people got off at Guangming Road Station than got on the bus. How many people are there on the bus now?
一辆大客车原有38人，到光明路站下车的比上车的多7人，大客车上现在有多少人？
<gadget id="calculator">38 - 7</gadget>
<output>31</output>

<result>31</result>