There were originally 45 passengers on the bus. After arriving at the transfer station, 10 people got off and 12 people got on. How many people are on the bus now?
车上原有乘客45人，到中转站后下去了10人，上来了12人，现在车上有多少人？
<gadget id="calculator">45 - 10</gadget>
<output>35</output>

<gadget id="calculator">35 + 12</gadget>
<output>47</output>

<result>47</result>