Task: Question Answering
Input (English): Problem: a 40 - liter solution of alcohol and water is 5 percent alcohol . if 3.5 liters of alcohol and 6.5 liters of water are added to this solution , what percent of the solution produced is alcohol ? 
Options: a ) 8 % , b ) 11 % , c ) 14 % , d ) 17 % , e ) 20 %
Output (English): b