Question 770241
	Price	----------------			quantity									
coffee type I	0.90	----------------			x	pounds								
Coffee type II	0.80	------	100	-	x	pounds								
Mixture	0.88	----------------	100											
	100													
0.9	x	+	0.8	(	100	-	x	)	=	88				
0.9	x	+	80	-	0.8	x	=			88				
0.9	x	-	0.8	x			=	88	-	-80				
0.1	x			=	8									
/	0.1													
	x			=	80		pounds			90 cents		coffee type I		
					20		pounds			80 cents		Coffee type II		
														
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