A can do a piece of work in 15 days and B in 20 days. They began the work together but 5 days before the completion of the work, A leaves. The work was completed in? Choose the correct choice from the following.
A) 11 2/3 days	B) 11 3/7 days	C) 8 days	D) 6 days	E) 5 days
A's 1 day's work =1/15   11 3/7 days's 1 day's work =1/20   5 days before the completion of the work, A leaves=X-5/15   (x â€“ 5)/15 + x/20 = 1   x = 11 3/7 days   Answer: Option 11 3/7 days
<result>B</result>
A can do a piece of work in 15 days and B in 20 days. They began the work together but 5 days before the completion of the work, A leaves. The work was completed in?