SOLUTION: Penter decides to mix grade of gasoline in his truck. He put in 5 gallons of regular and 10 gallons of premium for a total cost of $31.05. If premium gasoline cost $0.18 more per g

Algebra ->  Coordinate Systems and Linear Equations  -> Lessons -> SOLUTION: Penter decides to mix grade of gasoline in his truck. He put in 5 gallons of regular and 10 gallons of premium for a total cost of $31.05. If premium gasoline cost $0.18 more per g      Log On


   

Question 1101169: Penter decides to mix grade of gasoline in his truck. He put in 5 gallons of regular and 10 gallons of premium for a total cost of $31.05. If premium gasoline cost $0.18 more per gallon then regular what was the price of each grade of gasoline?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
PRICE%2AVOLUME=COST, basicidea 

             PRICE   GALLONS  COST(dollars)
REGULAR       p       5       5p
PREMIUM      p+0.18   10     10(p+0.18)
Total                 15      31.05

5p%2B%2810p%2B1.8%29=31.05
15p%2B1.8=31.05
highlight%28p=1.95%29---------price per gallon for regular
-
p%2B0.18=highlight%282.13%29------price for premium