A certain elementary school held a mathematics competition, with a total of 15 questions. The scoring standard was 8 points for one correct answer, and 4 points deducted for one wrong answer or failure to answer one question. Xiao Ming finally got 72 points. How many questions did he get right?
某小学举行数学竞赛，共15道题，评分标准是做对1题得8分，做错或不做1题倒扣4分，小明最后得72分，他做对了几道题？
<gadget id="calculator">15 * 8</gadget>
<output>120</output>

<gadget id="calculator">120 - 72</gadget>
<output>48</output>

<gadget id="calculator">8 + 4</gadget>
<output>12</output>

<gadget id="calculator">48 / 12</gadget>
<output>4</output>

<gadget id="calculator">15 - 4</gadget>
<output>11</output>

<result>11</result>