Xiao Ming calculated 20 competition questions, got 5 points for one correct answer, and deducted 3 points for wrong one. As a result, Xiao Ming scored 60 points in the test. Question: How many questions did he get right?
小明计算20道竞赛题，做对一道的5分，做错一道倒扣3分，结果小明考得60分．问：他一共做对了多少道题．
<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>