Question 635595
-------------- 	percent	----------------	Amount										
milk type I	1	----------------			80	gallons							
milk trype II	4	----------------			x	gallons							
Mixture	2	----------------	80	+	x	gallons							
													
1*80+4x	=2(80+x	)	
80+4x=	160+2	x					
4x-2x	=-80+160					
2x=80										
/2												
x=40		gallons	milk trype II								
													
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