Xiaoming's mid-term exam scores are 85 points in Chinese and 96 points in English. If the average score of Chinese, mathematics, and English is not less than 90 points, what is the minimum score for mathematics?
小明期中考试的成绩，语文85分，英语96分，要使语文、数学、英语三门课的平均成绩不低于90分，数学成绩至少应得多少分？
<gadget id="calculator">90 * 3</gadget>
<output>270</output>

<gadget id="calculator">270 - 85 - 96</gadget>
<output>89</output>

<result>89</result>