Ding Ding's average score in Chinese, Mathematics, and English in the mid-term exam is 91 points. He scored 87 points in Chinese, 92 points in English, and a few points in mathematics.
丁丁期中考试语文、数学、英语三门的平均分是91分，他语文考87分，英语92分，数学多少分．
<gadget id="calculator">91 * 3</gadget>
<output>273</output>

<gadget id="calculator">273 - 87 - 92</gadget>
<output>94</output>

<result>94</result>