Among the three classes in Grade 6, class 1 accounts for 25% of the total number of the three classes, and the ratio of class 2 to class 3 is 7; class 8 is 24 heads less than Class 3, Among the three classes in Grade 6, the number of class 1 accounts for 25% of the total number of the three classes, and the ratio of class 2 to class 3 is 7; 8 the number of class 1 is 24 less than that of class 3. What is the number of class 6

Among the three classes in Grade 6, class 1 accounts for 25% of the total number of the three classes, and the ratio of class 2 to class 3 is 7; class 8 is 24 heads less than Class 3, Among the three classes in Grade 6, the number of class 1 accounts for 25% of the total number of the three classes, and the ratio of class 2 to class 3 is 7; 8 the number of class 1 is 24 less than that of class 3. What is the number of class 6

If there are X students in class 1, the total number of students in Grade 6 is 4x, that in class 3 is x + 24, and that in class 2 is 4x-x - (x + 24) = 2x-24
If the ratio of class 2 to class 3 is 7:8, then (2x-24) / (x + 24) = 7 / 8, the solution is x = 40
So the number of sixth grade students is 4x = 240