Xiaohong's mid-term exam results, the average score of Chinese, mathematics, and English is 86 points, and the known Chinese score is 90 points. What is the average score of mathematics and English?
小红期中考试成绩，语文、数学、英语三科平均分86分，已知语文得分90分，数学和英语两科平均分是多少分．
<gadget id="calculator">86 * 3</gadget>
<output>258</output>

<gadget id="calculator">258 - 90</gadget>
<output>168</output>

<gadget id="calculator">168 / 2</gadget>
<output>84</output>

<result>84</result>