A can do a piece of work in 10 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 most appropriate option:
A) 8 2/3 days
B) 9 2/3 days
C) 10 2/3 days
D) 10 days
E) 11 days
Explanation:   2/10 + 4/15 + x/20 = 1   x = 32/3 = 10 2/3   Answer: 10 2/3 days
<result>C</result>
A can do a piece of work in 10 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?