Question 500208
	percent	----------------	quantity									
Alcohol I	7	----------------			9	ml						
Alcohol II	47	----------------			x	ml						
Mixture	17	----------------	9	+	x	ml						
												
7*9+47x	=17(9+x	)
63	+	47	x	=	153	+	17	x				
47	x	+	-17	x	=	153	-	-63				
30	x	=	90									
/	30											
x	=	3										
		3	ml		of	47	%	Alcohol II