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?  Choices
A) 11 3/9 B) 19 3/7 C) 11 3/5 D) 11 3/7 E) 11 3/1
(x – 5)/15 + x/20 = 1   x = 11 3/7 days   Answer:11 3/7
<result>D</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?