A total of 30 small questions need to be done in a test, 11 points are given for one correct answer, 6 points are deducted for one wrong answer, 0 points are given for not answering, and a student gets 17 points in total, so how many questions does the student not solve?
一次考试共需做30个小题，做对一个得11分，做错一个减6分，不做的得0分，某学生共得17分，那么这个学生没有做的题目有多少个．
<gadget id="calculator">30 - 7 - 10</gadget>
<output>13</output>

<result>13</result>