There are 15 questions in a math competition, 8 points for a correct answer, 4 points for a wrong answer, Xiaomei scored 72 points in this competition, how many questions did she get right in total.
一次数学竞赛，共有15道题，答对一题得8分，答错一题扣4分，小美在这次竞赛中得了72分，她一共做对多少题．
<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>