Task: Question Answering
Input (English): Problem: arun and tarun can do a work in 10 days . after 4 days tarun went to his village . how many days are required to complete the remaining work by arun alone . arun can do the work alone in 40 days . 
Options: a ) 16 days . , b ) 17 days . , c ) 18 days . , d ) 19 days . , e ) 24 days .
Output (English): e