Solve the following applied problem.
Finance Jack borrowed his father’s luxury car and promised to return it with a full tank of premium gas, which costs $2.50 per gallon. From experience, he knows that he needs 15.5 gallons. But he has only $38 (and no credit card), which isn’t enough. He decides to get as much premium as possible and fill the remainder of the tank with regular gas, which costs $2.30 per gallon. How much of each type of gas should he get?
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