Task: Question Answering
Input (English): Problem: a is thrice as good a work man as b and together they finish a piece of work in 16 days . the number of days taken by b alone to finish the work is : 
Options: a ) 64 days . , b ) 24 days . , c ) 52 days . , d ) 35 days . , e ) 28 days .
Output (English): a