Task: Question Answering
Input (English): Problem: a can do a piece of work in 20 days and b can do it in 30 days and c can do it 10 days . they started the work together and a leaves after 2 days and c leaves after 4 days from the beginning . how long will work lost ? 
Options: a ) 13 , b ) 16 , c ) 25 , d ) 14 , e ) 15
Output (English): e