In one test, Xiao Ming scored 86 points in Chinese, and naturally scored 90 points. Now he has to take the mathematics test. He wants to achieve an average score of 90 points in the three subjects. So what is the minimum score for his mathematics?
一次考试，小明语文得了86分，自然得了90分，现在要考数学，他想争取三科平均成绩达到90分，那么他的数学至少要得多少分？
<gadget id="calculator">90 * 3</gadget>
<output>270</output>

<gadget id="calculator">270 - 86 - 90</gadget>
<output>94</output>

<result>94</result>