Question 545682
George decides to mix grades of gasoline in his truck. He puts in 8 gallons of regular and 12 gallons of premium for a total cost of $55.80.  If premium gasoline costs $0.15 more per gallon than regular, what was the price of each grade of gasoline.
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8*p + 12*(p+15) = 5580
20p = 5400
p = $2.70/gallon of Reg
--> $2.85/gallon of premium