Task: Question Answering
Input (English): Problem: a and b can do a piece of work in 10 days , while b and c can do the same work in 15 days and c and a in 25 days . they started working together , after 4 days a left . after another 4 days b left . in how many days c can finish the remaining work ? 
Options: a ) 16 , b ) 32 , c ) 64 , d ) 96 , e ) none of these
Output (English): d