When a certain class counted the math scores of the mid-term exam, the average score calculated for the first time was 90.6 points. Later, it was found that Xiaodong's score was 79 points and it was miscalculated as 97 points. After the second recalculation, the average score was 90.2. How many students are there in this class?
某班统计期中考试数学成绩时，第一次计算的平均分是90.6分，后来发现小东的成绩是79分而误算成了97分．第二次重新计算后，平均分为90.2分．该班共有多少名学生？
<gadget id="calculator">97 - 79</gadget>
<output>18</output>

<gadget id="calculator">90.6 - 90.2</gadget>
<output>0.4</output>

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

<result>45</result>