25% of the candidates who appeared in an examination failed and only 450 students qualify the exam. The number of students who appeared in the examination was :

Answer: Option B

Percentage of failed students = 25%
∴ Percentage of passed students
= (100 - 25)% = 75%
According to the question,
Total students :
= $$\frac{450}{75}$$ × 100 = 600