SOLUTION: Lorena bought 10 packs of styrofoam cups for the graduation dance. a pack of fifty 12-oz cups costs \$1.80 and apack of fifty 16-oz cups costs \$2.40. Lorena paid a total of \$21.60 e

Algebra ->  Algebra  -> Systems-of-equations -> SOLUTION: Lorena bought 10 packs of styrofoam cups for the graduation dance. a pack of fifty 12-oz cups costs \$1.80 and apack of fifty 16-oz cups costs \$2.40. Lorena paid a total of \$21.60 e      Log On

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 Click here to see ALL problems on Systems-of-equations Question 181451: Lorena bought 10 packs of styrofoam cups for the graduation dance. a pack of fifty 12-oz cups costs \$1.80 and apack of fifty 16-oz cups costs \$2.40. Lorena paid a total of \$21.60 excluding tax. How many packs of each size cup did she buy?Answer by josmiceli(9661)   (Show Source): You can put this solution on YOUR website!Let = the number of packs of 12 oz cups she bought Let = the number of packs of 16 oz cups she bought given: (1) (2) Multiply both sides of (1) by 180 and subtract from (2) (2) (1) and, since (1) She bought 4 packs of 12 oz cups and 6 packs of 16 oz cups check answer: (2) (2) OK