Question

Kevin decides to mix grades of gasoline in his truck. He puts in 5 gallons of regular and 10 gallons of premium for a total cost of $61.30. If premium gasoline costs $0.22 more per gallon than regular, what was the price of each grade of gasoline?
If the regular gas costs x cents/gal, then

5x + 10(x+22) = 6130

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