In a certain class, the average score of mathematics is 84.1. Later, it was found that Xiaohong's score was 96, which was mistakenly recorded as 69. After recalculation, the average score was 84.7. How many students are there in this class?
某班统计数学成绩，平均成绩是84.1分，后来发现小红的成绩是96分，被错记成69分，重新计算后，平均成绩是84.7分，那么这个班有多少名学生．
<gadget id="calculator">96 - 69</gadget>
<output>27</output>

<gadget id="calculator">84.7 - 84.1</gadget>
<output>0.6</output>

<gadget id="calculator">27 / 0.6</gadget>
<output>45</output>

<result>45</result>