There are 40 students in the fifth grade class. They all participated in the English extracurricular interest group or the information technology class group. It is known that there are 32 students who participated in the English extracurricular group and 20 students who participated in the information technology extracurricular group. Then, two How many students are there in each group?
五年级一班有40人，他们都参加了英语课外兴趣小组或信息技术课小组，已知参加了英语课外小组的有32位同学，参加了信息技术课外小组的有20位同学，那么，两个小组都参加的同学有多少位？
<gadget id="calculator">20 - 40</gadget>
<output>-20</output>

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

<result>12</result>