Mixture $A$ is $20$ percent alcohol, and mixture $B$ is $50$ percent alcohol. If the two are poured together to

Mixture $A$ is $20$ percent alcohol, and mixture $B$ is $50$ percent alcohol. If the two are poured together to create a $15$-gallon mixture that contains $30$ percent alcohol, approximately how many gallons of mixture $A$ are in the mixture?

(A) 3 gallons
(B) 4 gallons
(C) 5 gallons
(D) 10 gallons
(E) 12 gallons

Answer: D

Source: Veritas Prep

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