A can do a piece of work in 18 days, B in 27 days, C in 36 days. They start worked together . But only C work till the completion of work. A leaves 4 days and B leaves 6 days before the completion of work. In how many days work be completed? Pick one:
A) 12
B) 11
C) 99
D) 27
E) 99
Let the work be completed in x days   (x-4)days of 12 + (x-6)days of B + x days of C = 1   \inline \Rightarrow \inline \frac{x-4}{18}+\frac{x-6}{27}+\frac{x}{36}=1   \inline \Rightarrow \frac{13x-48}{108}=1   x = 12   \inline \therefore Total time = 12 days   12nswer:12
<result>A</result>
A can do a piece of work in 18 days, B in 27 days, C in 36 days. They start worked together . But only C work till the completion of work. A leaves 4 days and B leaves 6 days before the completion of work. In how many days work be completed?