Cong Cong participated in a mathematics competition, with 25 questions in total, 4 points for each correct answer, 1 point deducted for each wrong answer or non-answer answer, and a total of 60 points, how many questions did Cong Cong get wrong?
聪聪参加一次数学竞赛，共25道题，做对一题得4分，做错或不做一题倒扣1分，共得了60分，聪聪做错了多少道．
<gadget id="calculator">25 * 4</gadget>
<output>100</output>

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

<gadget id="calculator">4 + 1</gadget>
<output>5</output>

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

<result>8</result>