There are 20 questions in a mathematics competition. You get 8 points for a correct question, and 4 points are deducted for a wrong question. Liu Dong scored 112 points in the test. Do you know how many questions Liu Dong got right?
一次数学竞赛共有20道题．做对一道题得8分，做错一题倒扣4分，刘冬考了112分，你知道刘冬做对了几道题？
<gadget id="calculator">20 * 8</gadget>
<output>160</output>

<gadget id="calculator">160 - 112</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">20 - 4</gadget>
<output>16</output>

<result>16</result>