Question 818746
---	percent	----------------	Amount									
milk 	20	----------------			60	liters						
water	0	----------------			x	liters						
Mixture	15	----------------	60	+	x	liters						
												
20	*	60	+	0	x	=	15	(	60	+	x	)
1200	+	0	x	=	900	+	15	x				
0	x		-15	x	=	-1200	+	900				
-15	x	=	-300									
/	-15											
x	=	20		liters	water							
												
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