There are 46 people in Class 1 of the third grade in our school, 30 people participated in the Chinese interest group, and 35 people participated in the mathematics interest group. How many people participated in both the Chinese interest group and the mathematics interest group?
我校三年级1班一共有46人，参加语文兴趣小组的有30人，参加数学兴趣小组的有35人，那么既参加语文兴趣小组又参加数学兴趣小组的多少人．
<gadget id="calculator">35 - 46</gadget>
<output>-11</output>

<gadget id="calculator">30 + (-11)</gadget>
<output>19</output>

<result>19</result>