Question 533600
	--------percent	----------------	quantity									
Solution I	25	----------------			12	liters						
Water	0	----------------			x	liters						
Mixture	20	----------------	12	+	x	liters						
												
25*12+0	x	=20(12+x)
300=	240	+	20	x				
-20	x	=	240	-	-300				
-20	x	=	-60									
/	-20											
x	=	3										
		3	liters		of			Water