Task: Question Answering
Input (English): Problem: a can finish a work in 24 days , b in 9 days and c in 12 days . b and c start the work but are forced to leave after 3 days . when a done the work ? 
Options: a ) 10 days , b ) 12 days , c ) 13 days , d ) 9 days , e ) 14 days
Output (English): a