Painter A can paint a house in 16 days, and painter B can do the same work in 20 days. With the help of painter C, they paint the house in 8 days only. Then, Painter C alone can do this task in Select.
A) 90 days
B) 45 days
C) 20 days
D) 50 days
E) 80 days
Work done by Painter A per day =1/16   Work done by Painter B per day =1/20   Work done by Painter A, Painter B, Painter C per day=1/10   Work done by Painter C per day = 1/10 - (1/16+1/20)=1/80   C can paint the house in 80 days.   80 days
<result>E</result>
Painter A can paint a house in 16 days, and painter B can do the same work in 20 days. With the help of painter C, they paint the house in 8 days only. Then, Painter C alone can do this task in