A can do in one day three times the work done by B in one day. They together finish $$\frac{2}{5}$$of the work in 9 days. The number of days by which B can do the work alone is = ?

A can do in one day three times the work done by B in one day. They to

1.	A can do in one day three times the work done by B in one day. They together finish $$\frac{2}{5}$$of the work in 9 days. The number of days by which B can do the work alone is = ?
A.	0 days
B.	20 days
C.	00 days
D.	0 days
Answer» B. 20 days