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
A). 8 2/3 days
B). 9 2/3 days
C). 10 2/3 days
D). 10 days
10 2/3 days
2/10 + 4/15 + x/20 = 1
x = 32/3 = 10 2/3