In an examination 35% of the students passed and 520 failed. How many students appeared for the examination?
Choose the correct choice from the following:
A) 540
B) 400
C) 800
D) 650
E) 840

Rationale: "let the number of students appeared be x then , 65 % of x = 520 65 x / 100 = 520 x = 520 * 100 / 65 = 800 answer is c"
Answer: C