what is the difference between the total number of students who have enrolled from coaching institute A from schools P and S together and the total number of students who have enrolled for coaching institute C from the same school together ?

Number of students who have enrolled from coaching institute A from schools P = 25% of 80 = 20
Number of students who have enrolled from coaching institute A from schools S =40 % of 80 = 32
Total = 52.

Number of students who have enrolled from coaching institute C from schools P = 32% of 200 = 64
Number of students who have enrolled from coaching institute C from schools S =31 % of 200 = 62
Total = 126.

Difference = 126 - 52 = 74
Option D is the correct answer