Between innings at his weekly softball game, Stan likes to have a sip or two of beer. He usually consumes about 6 cans, which he prefers at exactly 40oF. His wife Bernice puts a six-pack of 12-ounce aluminum cans of beer (1 ounce has a mass of 28.4 g) originally at 80oF in a well-insulated Styrofoam container and begins adding ice. How many 30-g ice cubes must she add to the container so that the final temperature is 40oF? (Neglect heat losses through the container and the heat removed from the aluminum and assume that the beer is mostly water.)