The average score of Naughty's three math tests is 91 points. It is known that the scores of the first and second math tests are both 90 points. What is her third score?
淘气三次数学考试的平均成绩是91分，已知第一次和第二次的数学考试成绩是都是90分，她的第三次成绩是多少分．
<gadget id="calculator">91 * 3</gadget>
<output>273</output>

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

<gadget id="calculator">273 - 180</gadget>
<output>93</output>

<result>93</result>