Task: Question Answering
Input (English): Problem: a does 4 / 5 th of a work in 20 days . he then calls in b and they together finish the remaining work in 3 days . how long b alone would take to do the whole work ? 
Options: a ) 23 days , b ) 37 days , c ) 37 ½ days , d ) 40 days , e ) 41 days
Output (English): c