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Solutions
The total number of students in the school is = 1750
Now, after 20 % increase in students, total number = 1750+350 = 2100
Now, number of passed students in 6th initially = 225
After increase of 20% = 225+45 = 270
Number of passed students in class 7th initially = 312
After increase of 25% = 312 +78 = 390
Number of passed students in class 8th initially= 305
After increase of 20%= 305 +61 = 366
Number of passed students in class 9th initially = 240
After increase of 10%= 240 +24 = 264
Number of passed students of class 10th = 310
After increase of 10% = 310 +31 = 341
Number of total passed students = 270+390+366+264+341 = 1631
Percentage = 