Task: Question Answering
Input (English): Question: A can do a piece of work in 16 days and B can do it in 15 days and C can do it 20 days. They started the work together and A leaves after 2 days and B leaves after 4 days from the beginning. How long will work lost?

 Option A: 10 2/5

 Option B: 10 2/0

 Option C: 12 1/6

 Option D: 10 2/1

 Option E: 12 2/3
Output (English): Option C