Task: Question Answering
Input (English): Problem: at a certain committee meeting only associate professors and assistant professors are present . each associate professor has brought 2 pencils and 1 chart to the meeting , while each assistant professor has brought 1 pencil and 2 charts . if a total of 7 pencils and 11 charts have been brought to the meeting , how many people are present ? 
Options: a ) 6 , b ) 7 , c ) 8 , d ) 9 , e ) 10
Output (English): a