Task: Question Answering
Input (English): Problem: the proportion of water to alcohol in solution a is 4 : 1 and the proportion of water to alcohol in solution b is 2 : 3 . if an equal amount of each solution is mixed together , what is the concentration of alcohol in the new solution ? 
Options: a ) 39 % , b ) 40 % , c ) 41 % , d ) 42 % , e ) 43 %
Output (English): b