A can do a piece of work in 20 days, b in 30 days and c in 60 days. All of them began to work together. However a left the job after 6 days and b quit work 6 days before the completion of work. How many days did the work last?
a. 20 days
b. 15 days
c. 25 days
d. 30 day
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d. 30 I think i am not sour
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