Task: Question Answering
Input (English): Problem: a and b can do a work in 20 days , b and c in 25 days , c and a in 30 days . if a , b and c work together , they will complete the work in ? 
Options: a ) 10 days , b ) 12 days , c ) 16 days , d ) 20 days , e ) 25 days
Output (English): c