Liangliang scored an average of 84 points in the previous English tests. In this test, he needs to score 100 points to raise his average score to 86 points. This is the first test.
亮亮前几次英语测试平均得84分，这次考试要考100分，才能把平均成绩提高到86分，这是第多少次测试．
<gadget id="calculator">100 - 84</gadget>
<output>16</output>

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

<gadget id="calculator">16 / 2</gadget>
<output>8</output>

<result>8</result>