Eric, a health enthusiast, enjoys mixing his own beverages. His current favorite is a carrot drink that contains 40% pure carrot juice. He has been to the store and has found some concentrated juice that is 60% pure carrot juice. His wife, Alicia, found some carrot juice on sale at a different health-food store, and she brought home 80 quarts. It contains 12% pure carrot juice. How many quarts of the concentrated 60% carrot juice does Eric need to add to the 80 quarts that Alicia brought home to produce his perfect drink containing 40% carrot juice?