In an examination, 25% of total students failed in Hindi, 35% failed in English and 40% in both. The percentage of these who passed in both the subjects is :  Choices:
A) 10 % B) 20 % C) 60 % D) 80 % E) 50 %

Rationale: "pass percentage = 100 - ( 25 + 35 - 40 ) = 100 - 20 = 80 answer : d"
Answer: D