Question 482134
percent	percentage	----------------			quantity							
Alcohol 	40	----------------			x	liters						
water	0	----------------	20	-	x	liters						
Mixture	25.00%	----------------	20									
												
40x+0(20-x)	=	25	*	20
												
40	x		=			500		
									
/	40											
	x=12.5	liters			40.00%		Alcohol 
	7.5liters		water
7.5 liters of mixture has to be replaced with water