There are 35 students in Class 303 of Guangming Primary School. When choosing an interest class, 18 students enrolled in the art class and 22 students enrolled in the music class. How many students enrolled in both the art class and the music class?
光明小学303班共有35名同学，在选择兴趣课时，有18人报了美术班，22人报了音乐班，既报美术班又报音乐班有多少人．
<gadget id="calculator">22 - 35</gadget>
<output>-13</output>

<gadget id="calculator">18 + (-13)</gadget>
<output>5</output>

<result>5</result>