Question 544527
	--------percent	----------------	quantity									
Nitric acid I	12	----------------			3	L						
Nitric Acid II	20	----------------			x	L						
Mixture	15	----------------	3	+	x	L						
												
12	*	3	+	20	x	=	15	(	3	+	x	)
36	+	20	x	=	45	+	15	x				
20	x	+	-15	x	=	45	-	-36				
5	x	=	9									
/	5											
x	=	1.8										
		1.8	L		of			Nitric Acid II