A can do a work in 15 days and B in 20 days. If they work on it together for 8 days, then the fraction of the work that is left is	Choose the most appropriate option
A) 8/17	B) 7/15	C) 3/15	D) 8/15	E) 1/15
Person ( A ) ( B ) ( A+B )   Time - ( 15 ) ( 20 ) (-)   Rate - ( 20 ) ( 15 ) ( 35 )   Work -(300) (300) (300)   therefore A+B requires (300/35) days to complete entire work   For 1st 4 days they work  35 * 8= 
<gadget id="calculator"> 35 * 8</gadget>
<output>280</output>
280   Remaining work is 300 - 280= 
<gadget id="calculator">300 - 280</gadget>
<output>20</output>
20   Remaining fraction of work is= 20/300 = 1/15   Answer 1/15
<result>E</result>
A can do a work in 15 days and B in 20 days. If they work on it together for 8 days, then the fraction of the work that is left is