A can do a piece of work in 12 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) 15 5/8 days
B) 10 5/8 days
C) 12 5/8 days
D) 19 5/8 days
E) 13 5/8 days
10 5/8 days   (x â€“ 5)/12 + x/20 = 1   x = 10 5/8 days
<result>B</result>
A can do a piece of work in 12 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?