Task: Question Answering
Input (English): Problem: a can do a piece of work in 9 days . when he had worked for 2 days b joins him . if the complete work was finished in 8 days . in how many days b alone can finish the work ? 
Options: a ) 18 , b ) 77 , c ) 66 , d ) 54 , e ) 12
Output (English): d