Peter 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 $31.05 If premium gasoline costs $0.18 more per gallon than regular, what was the price of each grade of gasoline?
x = cost of 5 gallons of regular
x + 0.18 = cost of 10 gallons of premium {premium is $0.18 more than regular per gallon} 5x + 10(x + 0.18) = 31.05 {number of gallons times price per gallon equals total price} 5x + 10x + 1.8 = 31.05 {used distributive property} 15x + 1.8 = 31.05 {combined like terms} 15x = 29.25 {subtracted 1.8 from each side} x = 1.95 {divided each side by 15} x + 0.18 = 2.13 {substituted 1.95, in for x, into x + 0.18} $1.95 is the price per gallon of 5 gallons of regular $2.13 is the price per gallon of 10 gallons of premium Ask Algebra House Comments are closed.

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