What is the percentage of vegetarian students in class 12?

Answer: Option A

Total Students = 800
No. of students in secondary = 80% of 800 = 640
Rest Students = 800 - 640 = 160
Rest students are divided equally into class 12 and 11. So,
No. of students in class 12 = $$\frac{160}{2}$$ = 80

Now, total vegetarian = 53%
No. of Total vegetarian = 53% of 800 = 424
55% of secondary students are vegetarian.
No. of vegetarian in secondary = 55% of 640 = 352
No. vegetarian in 11 = 50% of 80 = 40
Thus, no. of vegetarian in 12,
= 424 - 352 - 40 = 32
Thus,
In class 12 total vegetarian = 32.
So, % of vegetarian = $$\frac{32}{80}$$ × 100 = 40%