Task: Question Answering
Input (English): Problem: a dessert recipe calls for 50 % melted chocolate and 50 % raspberry puree to make a particular sauce . a chef accidentally makes 15 cups of the sauce with 40 % melted chocolate and 60 % raspberry puree instead . how many cups of the sauce does he need to remove and replace with pure melted chocolate to make the sauce the proper 50 % of each ? 
Options: a ) 1.5 , b ) 2.5 , c ) 3 , d ) 4.5 , e ) 5
Output (English): b