Zhang Ming went to the library by car. When he got on the car, he counted 48 people. When he arrived at the Children's Palace, 12 people came up and 16 people went down. How many people were on the car at this time?
张名乘车去图书馆，上车时他数了一下车上的人好似48人，到少年宫时上来12人，下去16人，这时车上有多少人？
<gadget id="calculator">12 - 16</gadget>
<output>-4</output>

<gadget id="calculator">48 + (-4)</gadget>
<output>44</output>

<result>44</result>