Concept:Find the number of vegetarians in class 12 using the total vegetarian count and the known vegetarians in other sections.
Explanation:Total students
=800.
Secondary section students
=80% of
800=640.
Remaining students
=800−640=160, equally divided between class 11 and class 12.
So class 11 students
=80 and class 12 students
=80.
Total vegetarians in school
=53% of
800=424.
Vegetarians in secondary section
=55% of
640=352.
Given vegetarians in class 11
=40.
Therefore, vegetarians in class 12
=424−352−40=32.
Percentage of vegetarians in class 12
=8032​×100=40%.
Answer:Option A:
40