<PRE><B>Question 426952</B>
The problem is set to just see your analatical ability. ( OR confuse you)

If you have 60% copper then naturally you will have 40% Nickel in the final alloy.

So lets say we need 60% copper in the alloy.

--------percent	----------------quantity							
Alloy 1	75	----------------x	pounds						
Alloy 2	55	----------------300-x	pounds			
Total	60.00%	----------------300					
75x+55(300-x)=	60*300
75x+16500-55x=18000		
75x-55x	=18000	-16500		
20x=1500							
/20											
x=75 pounds	75.00%	Alloy	
225 pounds of 55.00%	Alloy

---------------------
Work the other way using Nickel as the required %. you get the same quantities.

---------percent----------------quantity							
Alloy 1	25	----------------x	pounds						
Alloy 2	45	----------------300-x	pounds						
Total	5.00%	----------------300					
25x+45(300-x)=40*300
25x+13500-45x=12000		
25x-45x	=12000-13500		
-20x=	-1500							
/-20											
x=75 pounds	25.00% 		
												
												
					225			pounds		45.00%		


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