There are 100 students in Class 1 and Class 2 of the fourth grade of Kung Fu Primary School. In a mathematics test, the total average score of the two classes is 75.4, the average score of the first class is 73 points, and the average score of the second class is 78 points. May I ask: What is the difference between the number of people in class 1 and class 2?
功夫小学四年级一班和二班共有学生100名．在一次数学考试中，两班学生的总平均分是75.4分，其中一班的平均分是73分，二班的平均分是78分．请问：一班和二班的人数之差是多少？
<gadget id="calculator">100 * 75.4</gadget>
<output>7_540</output>

<gadget id="calculator">7_540 - 7_540</gadget>
<output>0</output>

<gadget id="calculator">0 + 5</gadget>
<output>5</output>

<gadget id="calculator">260 / 5</gadget>
<output>52</output>

<gadget id="calculator">100 - 52</gadget>
<output>48</output>

<gadget id="calculator">52 - 48</gadget>
<output>4</output>

<result>4</result>