The 55 people in class 3 subscribed to the magazine "Primary School Students" and "China Youth Daily", and each person subscribed to at least one of them. There were 38 people who subscribed to the "Primary School Student" magazine, and 25 people who subscribed to the "China Youth Daily". So, how many people have subscribed to both of these at the same time?
三1班55人征订《小学生》杂志和《中国少年报》，每人至少征订其中的一种．征订《小学生》杂志的有38人，征订《中国少年报》的有25人．那么，同时征订了这两种的一共有多少人？
<gadget id="calculator">25 - 55</gadget>
<output>-30</output>

<gadget id="calculator">38 + (-30)</gadget>
<output>8</output>

<result>8</result>