Task: Question Answering
Input (English): Problem: 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 : 
Options: a ) 10 % , b ) 20 % , c ) 30 % , d ) 70 % , e ) 50 %
Output (English): d