The average score of Xiaoqiao's first two math tests is 91, and the score of the third test is 88. What is the average score of Xiaoqiao's three tests?
小巧前两次数学测验的平均成绩是91分，第三次的成绩88分，求小巧三次测验的平均成绩是多少分？
<gadget id="calculator">91 * 2</gadget>
<output>182</output>

<gadget id="calculator">182 + 88</gadget>
<output>270</output>

<gadget id="calculator">270 / 3</gadget>
<output>90</output>

<result>90</result>