There are 20 questions in a certain mathematics competition. The scoring standard is: 6 points for each correct question, and 2 points for each wrong answer or failure to answer a question. Xiaohua participated in this competition and scored 80 points. How many questions did Xiaohua get right?
某次数学竞赛共20道题，评分标准是：每做对一题得6分，每做错或不做一题扣2分．小华参加了这次竞赛，得了80分．问小华做对了几道题？
<gadget id="calculator">20 * 6</gadget>
<output>120</output>

<gadget id="calculator">120 - 80</gadget>
<output>40</output>

<gadget id="calculator">6 + 2</gadget>
<output>8</output>

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

<gadget id="calculator">20 - 5</gadget>
<output>15</output>

<result>15</result>