There are 5 students participating in the municipal Olympic mathematics competition. The average score of the 4 students in the midterm is 80 points. After adding Xiaogang's score, the average score is 82 points. How much is Xiaogang's test score?
有5名同学参加市奥林匹克数学竞赛，期中4人的平均成绩是80分，加上小刚的分数后，平均成绩是82分，小刚考多少分．
<gadget id="calculator">82 * 5</gadget>
<output>410</output>

<gadget id="calculator">80 * 4</gadget>
<output>320</output>

<gadget id="calculator">410 - 320</gadget>
<output>90</output>

<result>90</result>