passenger car arrives at the station and gets off with 12 people, and then 5 people get on. At this time, there are 25 people on the bus. How many people were there on the bus? (solution by equation)
一辆客车到站后下去12人，又上来5人，这时车上有25人，原来客车上有多少人？(用方程解)
<gadget id="calculator">25 - 5</gadget>
<output>20</output>

<gadget id="calculator">12 + 20</gadget>
<output>32</output>

<result>32</result>