In an oral arithmetic competition, it is stipulated that 8 points will be awarded for a correct answer, and 5 points will be deducted for a wrong answer. Xiaohua answered 18 questions and scored 92 points. How many questions did Xiaohua get wrong in this competition?
一次口算比赛，规定：答对一题得8分，答错一题扣5分．小华答了18道题，得92分，小华在此次比赛中答错了多少道题．
<gadget id="calculator">18 * 8</gadget>
<output>144</output>

<gadget id="calculator">144 - 92</gadget>
<output>52</output>

<gadget id="calculator">8 + 5</gadget>
<output>13</output>

<gadget id="calculator">52 / 13</gadget>
<output>4</output>

<result>4</result>