Question 500050
	percent	----------------	quantity									
Antifreeze I	40	----------------			5	quarts						
Antifreeze II	100	----------------			x	quarts						
Mixture	60	----------------	15	+	x	quarts						
												
40	*	5	+	100	x	=	60	(	15	+	x	)
200	+	100	x	=	900	+	60	x				
100	x	+	-60	x	=	900	-	-200				
40	x	=	700									
/	40											
x	=	17.5										
		17.5	quarts		of	100	%	Antifreeze II
So 17.5 quarts has to be drained				
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