The results of Xiaoming's mid-term exam are as follows: the average score of Chinese, English, and general knowledge is 85 points, and the average score of mathematics, English, and general knowledge is 87 points. It is known that the mathematics score is 97 points, and the Chinese score is how many points.
小明期中考试的成绩如下：语文、英语、常识三科的平均成绩85分，数学、英语、常识平均成绩87分．已知数学成绩为97分，语文成绩多少分．
<gadget id="calculator">87 * 3</gadget>
<output>261</output>

<gadget id="calculator">85 * 3</gadget>
<output>255</output>

<gadget id="calculator">261 - 255</gadget>
<output>6</output>

<gadget id="calculator">97 - 6</gadget>
<output>91</output>

<result>91</result>