Task: Question Answering
Input (English): Problem: 8 men can dig a pit in 20 days . if a man works half as much again a s a boy , then 4 men and 9 boys can dig a similar pit in : 
Options: a ) 10 days , b ) 12 days , c ) 15 days , d ) 16 days , e ) 20 days
Output (English): d