Question 803344
---	percent	----------------	Amount									
Alcohol solution	20	----------------			20	liters						
pure alcohol	100	----------------			x	liters						
Mixture	80	----------------	20	+	x	liters						
												
20	*	20	+	100	x	=	80	(	20	+	x	)
400	+	100	x	=	1600	+	80	x				
100	x		-80	x	=	-400	+	1600				
20	x	=	1200									
/	20											
x	=	60		liters	pure alcohol							
												
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