Question 492605
----------------	percent	----------------	quantity									
Alcohol I	45	----------------			12	liters						
Alcohol II	70	----------------			x	liters						
Mixture	60	----------------	12	+	x	liters						
												
45	*	12	+	70	x	=	60	(	12	+	x	)
540	+	70	x	=	720	+	60	x				
70	x	+	-60	x	=	720	-	-540				
10	x	=	180									
/	10											
x	=	18										
		18	liters		of	70	%	Alcohol