Question 519475
	--------percent	----------------	quantity									
Antifreeze I	80	----------------			15	quarts						
water	0	----------------			x	quarts						
Mixture	75	----------------	15	+	x	quarts						
												
80*15+0	x=	75(15+x	)
1200+0	x=1125	+	75	x				
	-75	x	=	1125	-	-1200				
-75	x	=	-75									
/	-75											
x	=	1										
		1	quart		of	water