Task: Question Answering
Input (English): Problem: a and b can do a piece of work in 12 days and 16 days respectively . both work for 3 days and then a goes away . find how long will b take to complete the remaining work ? 
Options: a ) 6 days , b ) 12 days , c ) 15 days , d ) 9 days , e ) 8 days
Output (English): d