The sixth grade of Donghu Primary School held a mathematics competition with a total of 20 questions. 5 points for a correct answer, 3 points deducted for a wrong answer or an incorrect answer. Liu Gang scored 60 points, how many questions did he get right.
东湖小学六年级举行数学竞赛，共20道试题．做对一题得5分，没有做一题或做错一题倒扣3分．刘刚得了60分，则他做对了多少题．
<gadget id="calculator">5 * 20</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>