Task: Question Answering
Input (English): Problem: john and roger can finish the work 24 days if they work together . they worked together for 16 days and then roger left . john finished the remaining work in another 16 days . in how many days john alone can finish the work ? 
Options: a ) 30 days , b ) 48 days , c ) 70 days , d ) 80 days , e ) 90 days
Output (English): b