In an examination, 50% students failed in English and 40% in Maths and 15% students failed in both subjects. If 200 students passed in both the subjects. Find the number of students appear in Exam.

Correct option is C

Given:
50% of students failed in English.
40% of students failed in Maths.
15% of students failed in both English and Maths.
200 students passed in both subjects.

Solution:

Let total number students 100x.

Total students = Total failed students + Total passed students 

100x = 75x + 200

25x = 200

x = 8

Total students = 100x = $$100 \times 8$$ = 800

So, the number of students appear in exam is 800.

Thus, the correct answer is (c).