There are 20 questions in a certain math competition. The scoring standard is: 5 points for each correct answer, and 3 points for each wrong answer or failure to answer a question. Xiao Ming scored 68 points in this math competition, so if Xiao Ming got it right How many questions?
某次的数学竞赛共有20道题，评分标准是：每做对一题得5分，每做错或不做一题扣3分，小明了这次数学竞赛，得了68分，那么小明做对了几道题？
<gadget id="calculator">20 * 5</gadget>
<output>100</output>

<gadget id="calculator">100 - 68</gadget>
<output>32</output>

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

<gadget id="calculator">32 / 8</gadget>
<output>4</output>

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

<result>16</result>