A can do a piece of work in 15 days and B in 20 days. If they together work it for 4 days, then the fraction of the work that is left is:

A can do a piece of work in 15 days and B in 20 days. If they together

1.	A can do a piece of work in 15 days and B in 20 days. If they together work it for 4 days, then the fraction of the work that is left is:
A.	$${8 over 15}$$
B.	$${7 over 15}$$
C.	$${1 over 4}$$
D.	$${1 over 10}$$
Answer» B. $${7 over 15}$$

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A can do a piece of work in 15 days and B in 20 days. If they together work it for 4 days, then the fraction of the work that is left is:

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