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Mixture Problem with Refresher in answers: GMAT, GRE, SAT

Four-ninths of a drink mix is dye and the rest is pure ugar. When the mix is added to water a gallon of the drink is made that is 7.5% sugar. What percentage of the gallon is dye?


(A) 6
(B) 6.5
(C) 7.5
(D) 8
(E) 24