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A gas station owner has 30 gallons of gasoline worth $1.20 per gallon and some worth $1.40 per gallon. How many gallons of the $1.40

A gas station owner has 30 gallons of gasoline worth $1.20 per gallon and some worth $1.40 per

gallon. How many gallons of the $1.40 brand must the owner mix in to produce gasoline that

costs $1.28 per gallon?

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