A can do a piece of work in 12 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?
Choices:
A) 11 2/5 B) 10 2/0 C) 10 2/3 D) 10 2/1 E) 11 1/3
2/12 + 4/15 + x/20 = 1   x = 34/3 = 11 1/3 Answer: 11 1/3
<result>E</result>
A can do a piece of work in 12 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?