A can do a work in 15 days and B in 20 days. If they work on it together for 5 days, then the fraction of the work that is left is  Select
A) 8/17	B) 7/15	C) 3/15	D) 5/12	E) 1/4
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 5 days they work  35 * 5= 
<gadget id="calculator"> 35 * 5</gadget>
<output>175</output>
175   Remaining work is 300 - 175= 
<gadget id="calculator">300 - 175</gadget>
<output>125</output>
125   Remaining fraction of work is= 125/300 = 5/12   Answer 5/12
<result>D</result>
A can do a work in 15 days and B in 20 days. If they work on it together for 5 days, then the fraction of the work that is left is