Task: Question Answering
Input (English): Problem: the average of marks obtained by 120 candidates was 35 . if the avg of marks of passed candidates was 39 and that of failed candidates was 39 and that of failed candidates was 15 , the no . of candidates who passed the examination is ? 
Options: a ) 80 , b ) 90 , c ) 100 , d ) 120 , e ) 130
Output (English): c