Question 672461
	percent	----------------			quantity								
Acid solution I	12	----------------			x	liters							
Acid solution II	20	------	4	-	x	liters							
Mixture	15	----------------	4										
													
12x+20(4-x)=15*4	
1200x+2000(4-x)	=6000			
1200x+8000-2000	x=6000			
1200x-	2000x=6000	-8000			
-800	x			=	-2000								
/	-800												
x=2.5	liters			12.00%		Acid solution I	
1.5	liters			20.00%		Acid solution II	
													
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