Question 838111
	Percent	----------------			quantity									
Antifreeze 100%	100.00%	----------------			x	liters								
Antifreeze 20%	20.00%	------	20	-	x	liters								
Mixture	70.00%	----------------	20											
Total	20		liters											
100.00%	x	+	20.00%	(	20	-	x	)	=	70.00%	*	20		
100	x	+	20	(	20	-	x	)	=	1400				
100	x	+	400	-	20	x	=			1400				
100	x	-	20	x			=	1400	-	-400				
80	x			=	1000									
/	80													
	x			=	12.5		liters			100.00%		Antifreeze 100%		
					7.5		liters			20.00%		Antifreeze 20%		
														
m.ananth@hotmail.ca	

The quantity you need to increase the percentage to 70 is the amount to be drained
													
12.5 liters has to be drained