Jack borrowed his father’s luxury car and promised to return it with a full tank of premium gas, which costs $3.80 per gallon. From experience, he knows that he needs 15.5 gallons. He has, however, only $50 (and no credit card). He decides to get as muchpremium as possible and fill the remainder of the tank with regular gas, which costs $3.10 per gallon.
If he has $53, how much of each type of gas should he get?
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