The mathematics teacher was calculating the mathematics scores of Class 1, Grade 6. The average score was 70.25 points. During the review, he found that Tashi’s 68 points were mistakenly recorded as 86 points. When he calculated again, the average score was 69.85 points. How many students are there in this class?
数学老师在计算六年级1班的数学成绩，平均成绩为70.25分，复查时发现，扎西的68分误记作86分，再次计算时，平均成绩为69.85分，这个班共有学生多少人．
<gadget id="calculator">86 - 68</gadget>
<output>18</output>

<gadget id="calculator">70.25 - 69.85</gadget>
<output>0.4</output>

<gadget id="calculator">18 / 0.4</gadget>
<output>45</output>

<result>45</result>