Question 940040
	Price	----------------			quantity							
coffee type I	$4.00	----------------			x	lb						
coffee type II	$7.00	------	90	-	x	lb						
Mixture	6.00%	----------------	90									
Total	90		lb									
4	x	+	7	(	90	-	x	)	=	540		
4	x	+	630	-	7	x	=			540		
4	x	-	7	x			=	540	-	-630		
-3	x			=	-90							
/	-3											
	x			=	30		lb			$4.00		coffee type I
					60		lb			$7.00		coffee type II
												
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