The school held a math competition, with 12 questions in total, 15 points for each correct question, and 3 points deducted for each wrong question. Xiao Ming scored 144 points. How many questions did he get wrong?
学校举行数学竞赛，共有12道题，每做对一道题得15分，做错一道题倒扣3分．小明得了144分，他做错了几道题？
<gadget id="calculator">15 * 12</gadget>
<output>180</output>

<gadget id="calculator">180 - 144</gadget>
<output>36</output>

<gadget id="calculator">15 + 3</gadget>
<output>18</output>

<gadget id="calculator">36 / 18</gadget>
<output>2</output>

<result>2</result>