There are 45 people in class 31, 29 people participate in the mathematics group, 16 people participate in the language group, and 11 people participate in both groups. How many individuals did not participate in both groups.
三1班有45人，29人参加数学小组，16人参加语文小组，11人两个小组都参加．有多少个人两组都没有参加．
<gadget id="calculator">16 - 11</gadget>
<output>5</output>

<gadget id="calculator">29 + 5</gadget>
<output>34</output>

<gadget id="calculator">45 - 34</gadget>
<output>11</output>

<result>11</result>