Task: Question Answering
Input (English): Problem: one fourth of a solution that was 10 % sugar by weight was replaced by a second solution resulting in a solution that was 20 percent sugar by weight . the second solution was what percent sugar by weight ? 
Options: a ) 65 % , b ) 50 % , c ) 22 % , d ) 18 % , e ) 8.5 %
Output (English): b