The average score of Li Mei's previous math tests was 90 points. This time, she needs to score 100 points in order to raise her average score to 92 points. How many quizzes is this?
李梅前几次数学测验平均成绩是90分，这一次要考100分，才能把平均成绩提高到92分．这是第几次测验？
<gadget id="calculator">100 - 90</gadget>
<output>10</output>

<gadget id="calculator">92 - 90</gadget>
<output>2</output>

<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<result>5</result>