Question 581163
-------------- 	percent	----------------	Amount									
Alcohol	90	----------------			20	liters						
Water	0	----------------			x	liters						
Total	50	----------------	20	+	x	liters						
												
90*20+0	x=50(20	+x)
1800+0x	=1000+50x				
-50x=-1800+1000				
-50x	=	-800									
/	-50											
x	=	16	of	liters	Water