There are 20 questions in the civilized city knowledge competition organized by the school. Each correct answer is worth 5 points, and 1 point will be deducted for wrong answers or no answers. Xiao Ming finally gets 76 points, so how many questions does he answer correctly?
学校组织有关文明城市知识竞赛共有20道题，每一题答对得5分，答错或不答倒扣1分，小明最终得76分，那么他答对多少题．
<gadget id="calculator">20 * 5</gadget>
<output>100</output>

<gadget id="calculator">100 - 76</gadget>
<output>24</output>

<gadget id="calculator">5 + 1</gadget>
<output>6</output>

<gadget id="calculator">24 / 6</gadget>
<output>4</output>

<gadget id="calculator">20 - 4</gadget>
<output>16</output>

<result>16</result>