Several students calculate the average score of their language test together. If Zhao Feng's score increases by 8 points, their average score will reach 90 points. If Zhao Feng's score is reduced by 12 points, their average score is only 85 points. Find their actual average score.
几位同学一起算他们语文考试的平均分．若赵峰的得分提高8分，则他们的平均分就达到90分．若赵峰的得分降低12分，则他们的平均分只有85分，求他们实际的平均分．
<gadget id="calculator">8 + 12</gadget>
<output>20</output>

<gadget id="calculator">90 - 85</gadget>
<output>5</output>

<gadget id="calculator">20 / 5</gadget>
<output>4</output>

<gadget id="calculator">8 / 4</gadget>
<output>2</output>

<gadget id="calculator">90 - 2</gadget>
<output>88</output>

<result>88</result>