A can do a piece of work in 20 days and B in 40 days. If they work together for 5 days, then the fraction of the work that is left is ?

A can do a piece of work in 20 days and B in 40 days. If they work tog

1.	A can do a piece of work in 20 days and B in 40 days. If they work together for 5 days, then the fraction of the work that is left is ?
A.	$\frac{5}{8}$$
B.	$\frac{8}{{15}}$$
C.	$\frac{7}{{15}}$$
D.	$\frac{1}{{10}}$$
Answer» B. $\frac{8}{{15}}$$