test in a certain class, the average score is 91.3 points. During the review, it was found that Zhang Jing's score of 89 was mistakenly calculated as 97. After recalculation, the average score of the class was 91.1. How many students are there in the class?
某班的一次测验，平均成绩是91.3分．复查时发现把张静的89分误看作97分计算，经重新计算，该班平均成绩是91.1分．问全班有多少同学？
<gadget id="calculator">97 - 89</gadget>
<output>8</output>

<gadget id="calculator">91.3 - 91.1</gadget>
<output>0.2</output>

<gadget id="calculator">8 / 0.2</gadget>
<output>40</output>

<result>40</result>