There are a total of 20 test questions in the environmental protection knowledge contest. If you answer a question correctly, you get 5 points, and if you don’t answer or answer a wrong question, 3 points will be deducted. Liu Gang got 60 points. How many questions did he get right?
在环保知识竞赛中一共有20道测试题，答对一题得5分，不答或答错一题扣3分，刘刚得了60分，他做对了多少道题？
<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>