There were 20 questions in a certain mathematics competition, and the scoring standard was: 5 points for each correct answer, 3 points for each incorrect or missed question. Qin Litao scored 60 points for participating in this competition. How many questions did he get right?
某次数学竞赛共20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，秦利涛参加这次竞赛得了60分，他做对了多少题？
<gadget id="calculator">20 * 5</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>

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

<result>15</result>