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?  Pick:
A) 1/7	B) 2/8	C) 3/9	D) 4/5	E) 113/7
113/7xplanation:   (x â€“ 5)/15 + x/20 = 1   x = 11 3/7 days   Answer:113/7
<result>E</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?