The sixth grade of Jiefang Road Primary School held a mathematics competition. There were 20 test questions in total. If you answered a question correctly, you would get 5 points. If you did not answer a question or did a wrong question, you would be deducted 3 points. If Xiaojian completed all the questions and got 60 points, then if he did something wrong How many questions?
解放路小学六年级举行数学竞赛，共有20道试题，做对一题得5分，没做或做错一题都要倒扣3分，小建做完了所有题目得了60分，那么他做错了几道题？
<gadget id="calculator">5 * 20</gadget>
<output>100</output>

<gadget id="calculator">100 - 60</gadget>
<output>40</output>

<gadget id="calculator">5 + 3</gadget>
<output>8</output>

<gadget id="calculator">40 / 8</gadget>
<output>5</output>

<result>5</result>