Task: Question Answering
Input (English): Problem: x is able to do a piece of work in 8 days and y can do the same work in 12 days . if they can work together for 3 days , what is the fraction of work left ? 
Options: a ) 8 / 5 , b ) 6 / 5 , c ) 7 / 5 , d ) 3 / 5 , e ) 4 / 5
Output (English): d