Task: Question Answering
Input (English): Problem: it was calculated that 100 men could complete a piece of work in 20 days . when work was scheduled to commence , it was found necessary to send 50 men to another project . how much longer will it take to complete the work ? 
Options: a ) 45 days . , b ) 40 days . , c ) 38 days . , d ) 35 days . , e ) 30 days .
Output (English): b