Task: Question Answering
Input (English): Problem: a survey of n people in the town of eros found that 50 % of them preferred brand a . another surveyof 100 people in the town of angie found that 60 % preferred brand a . in total , 55 % of all the people surveyed together preferred brand a . what is the total number of people surveyed ? 
Options: a ) 50 , b ) 100 , c ) 150 , d ) 200 , e ) 250
Output (English): d