Li Ming scored an average of 92 points in the two subjects of Chinese and mathematics in the mid-term exam. After the English results came out, the average score of the three subjects was 87 points. What is the score of Li Ming's English mid-term exam?
李明期中考试语文，数学两门功课的平均成绩是92分，等英语成绩出来后三门功课的平均成绩是87分．李明英语期中考试的成绩是多少分？
<gadget id="calculator">87 * 3</gadget>
<output>261</output>

<gadget id="calculator">92 * 2</gadget>
<output>184</output>

<gadget id="calculator">261 - 184</gadget>
<output>77</output>

<result>77</result>