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?  Choose the correct choice from the following answers
A) 10 2/5
B) 10 2/0
C) 12 1/6
D) 10 2/1
E) 12 2/3
2/16 + 4/15 + x/20 = 1   x = 73/6 = 12 1/6 Answer: 12 1/6
<result>C</result>
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?