Task: Question Answering
Input (English): Problem: a group of students was interviewed for that if it was asked whether or not they speak french and / or english . among those who speak french , 30 speak english well , while 40 of them do not speak english . if 86 % of students do not speak french , how many students were surveyed ? 
Options: a ) 500 , b ) 450 , c ) 250 , d ) 350 , e ) 525
Output (English): a