The following table shows the total number of students in four different classes of a school, and the percentages of students participating in Music or Plays from each of these four different classes. NO student participates both in Music and in Plays.

What is the total number of students who do NOT participate in Music or Plays from classes X and VII, taken together?

675

Total  number of students in X = 600

Number of students who are not in music or play in X  =600 -  \(\frac{12+8 }{100}\) × 600

= 480 

Total  number of students in VII = 250

Number of students who are not in music or play in VII  = 250 -  \(\frac{10+12 }{100}\) × 250

= 195 

Total number of students who do not participate in music or play from X & VII = 480 + 195

= 675