In an examination, 30% of total students failed in Hindi, 35% failed in English and 35% in both. The percentage of these who passed in both the subjects is :
Choose the correct choice from the following answers:
A) 10 % B) 20 % C) 30 % D) 70 % E) 50 %

Rationale: "pass percentage = 100 - ( 30 + 35 - 35 ) = 100 - 30 = 70 answer : d"
Answer: D