In Xiaohua's final exam last semester, the average score of the two courses of Chinese and Mathematics was 90 points. If the average score of the three courses other than Chinese and Mathematics is 93 points, how many points must be scored in the foreign language test.
小华上学期期末考试时，语文和数学这两门课的平均分是90分，要想语数外三门课平均分达到93分，外语必须考多少分．
<gadget id="calculator">93 * 3</gadget>
<output>279</output>

<gadget id="calculator">90 * 2</gadget>
<output>180</output>

<gadget id="calculator">279 - 180</gadget>
<output>99</output>

<result>99</result>