Question 787646
---	percent	----------------	Amount									
Alcohhol	90	----------------			20	liters						
Water	0	----------------			x	liters						
Mixture	50	----------------	20	+	x	liters						
												
90	*	20	+	0	x	=	50	(	20	+	x	)
1800	+	0	x	=	1000	+	50	x				
0	x		-50	x	=	-1800	+	1000				
-50	x	=	-800									
/	-50											
x	=	16		liters	Water							
												
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