Liu Jia's average score in the first and second tests of Mathematics is 90 points. After the third test, the average score of the three times is 93 points. What is the score of the third test?
刘佳数学第1，2次测验的平均成绩是90分，第三次测验后，三次的平均成绩是93分，第三次的成绩是多少分．
<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>