A certain elementary school held a mathematics competition. For each correct answer, 10 points were awarded, and 2 points were deducted for each wrong answer. There were 15 questions in total, and Xiaohua scored 102 points. How many questions did Xiaohua answer correctly (must not do)?
某小学进行数学竞赛，每答对一道题得10分，答错一道题倒扣2分，共15道题，小华得了102分．小华答对几道题(不能不做)？
<gadget id="calculator">15 * 10</gadget>
<output>150</output>

<gadget id="calculator">150 - 102</gadget>
<output>48</output>

<gadget id="calculator">10 + 2</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>