In a mathematics competition, there were only two test questions. As a result, there were only 17 students in the class who were all correct, 26 people got the second question right, 33 people got the first question wrong, and how many people got both questions wrong.
一次数学竞赛，测试题只有两道，结果全班只有17人全对，做对第二道题的有26人，做错第一道题的共33人，两题都错的有多少人．
<gadget id="calculator">26 - 17</gadget>
<output>9</output>

<gadget id="calculator">33 - 9</gadget>
<output>24</output>

<result>24</result>