Task: Question Answering
Input (English): Problem: a can do a work in 12 days . when he had worked for 3 days , b joinedhim . if they complete the work in 3 more days , in how manydays can balone finish the work ? 
Options: a ) 2 days , b ) 4 days , c ) 5 days , d ) 6 days , e ) 9 days
Output (English): d