Xiaoqing's average score in the previous exams was 84 points. This time, she scored 96 points in the exam, so she raised her average score to 86 points. This is the first exam.
小青前几次考试的平均成绩为84分，这一次考了96分，就把平均成绩提高到86分，这一次是第多少次考试．
<gadget id="calculator">96 - 84</gadget>
<output>12</output>

<gadget id="calculator">86 - 84</gadget>
<output>2</output>

<gadget id="calculator">12 / 2</gadget>
<output>6</output>

<result>6</result>