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OpenStudy (anonymous):
The total cost of 10 gallons of regular gasoline and 15 gallons of premium gasoline is $32.75. Premium costs $.20 more per gallon than regular. What is the cost per gallon of each type of gas? How do I solve this using the substitution method?
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OpenStudy (anonymous):
15(x + .20) + 10x = $32.75 25x + 3 = 32.75 25x = 29.75 x = 1.19
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