Task: Question Answering
Input (English): Problem: a can do a job in 9 days and b can do it in 27 days . a and b working together will finish twice the amount of work in - - - - - - - days ? 
Options: a ) 22 days , b ) 18 days , c ) 22 6 / 2 days , d ) 27 days , e ) 9 days
Output (English): b