# SOLUTION: How many quarts of water must be added to 9 qt of an 80% antifreeze solution to make a 45% antifreeze solution?

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 Question 342247: How many quarts of water must be added to 9 qt of an 80% antifreeze solution to make a 45% antifreeze solution?Answer by mananth(12270)   (Show Source): You can put this solution on YOUR website!let water required be x qt. 0% 9 qt 80% Mixture = (x+9) qt 45% .. 9*0.8 = (x+9)*0.45 7.2=0.45x+4.05 0.45x=7.20-4.05 divide by 0.45 x= 3.15/0.45 x= 7 qt of water