Question 968792
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 gasoline? 
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10R + 15P = 3275
P = R + 20
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Sub for P
10R + 15*(R+20) = 3275
25R + 300 = 3275
R = 119
P = 139