Task: Question Answering
Input (English): Problem: x can finish a work in 18 days . y can finish the same work in 15 days . yworked for 5 days and left the job . how many days does x alone need to finish the remaining work ? 
Options: a ) 12 , b ) 5 , c ) 6 , d ) 8 , e ) 9
Output (English): a