When 36 students answered two questions, 23 people answered the first question correctly, 25 people answered the second question correctly, 14 students answered both questions correctly, and how many people answered neither question correctly.
36个学生回答两个问题时，答对第一题的有23人，答对第二题的有25人，两题都答对的有14人，两题都没答对的有多少人．
<gadget id="calculator">23 - 14</gadget>
<output>9</output>

<gadget id="calculator">25 + 9</gadget>
<output>34</output>

<gadget id="calculator">36 - 34</gadget>
<output>2</output>

<result>2</result>