A certain school held an environmental protection knowledge contest with a total of 20 questions. 8 points for a correct answer, 5 points for a wrong answer, and 0 points for no answer. Xiao Ming scored 134 points in total, how many questions did he answer correctly?
某校举行环保知识竞赛，一共20题．答对一题得8分，答错一题倒扣5分，没有回答得0分．小明共得134分，答对了多少题．
<gadget id="calculator">20 * 8</gadget>
<output>160</output>

<gadget id="calculator">160 - 134</gadget>
<output>26</output>

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

<gadget id="calculator">26 / 13</gadget>
<output>2</output>

<gadget id="calculator">20 - 2</gadget>
<output>18</output>

<result>18</result>