Question 731014
---	percent	----------------	Amount									
Solution	40	----------------			50	ml						
Water	0	----------------			x	ml						
Mixture	20	----------------	50	+	x	ml						
												
40	*	50	+	0	x	=	20	(	50	+	x	)
2000	+	0	x	=	1000	+	20	x				
0	x		-20	x	=	-2000	+	1000				
-20	x	=	-1000									
/	-20											
x	=	50		ml	Water							
												
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