Question 778462
---	percent	----------------	Amount									
Copper Alloy I	60	----------------			200	Oz						
copper qlloy II	30	----------------			x	Oz						
Mixture	40	----------------	200	+	x	Oz						
												
60	*	200	+	30	x	=	40	(	200	+	x	)
12000	+	30	x	=	8000	+	40	x				
30	x		-40	x	=	-12000	+	8000				
-10	x	=	-4000									
/	-10											
x	=	400		Oz	copper qlloy II							
												
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