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

A can do a work in 15 days and B in 20 days.If they together work on i

1.	A can do a work in 15 days and B in 20 days.If they together work on it for 4 days, then the fraction of the work that is left is:
A.	<table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>8</center></td></tr><td align="center">15</td></table>
B.	<table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>7</center></td></tr><td align="center">15</td></table>
C.	<table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>1</center></td></tr><td align="center">4</td></table>
D.	<table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>1</center></td></tr><td align="center">10</td></table>
Answer» B. <table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>7</center></td></tr><td align="center">15</td></table>

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

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