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? Choose the correct choice from the following answers:
A) 12	B) 15	C) 14	D) 13	E) 11
Explanation:   Let the work be completed in x days   (x-4)days of 12 + (x-6)days of B + x days of C = 1   =&gt;x-4/18 + x-6/27 + x/36 = 1   =&gt; 13 x-48 /108 =1   x=12   Total time = 12 days   12NSWER IS 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?