SOLUTION: an automobile engine can run on a mixture of gasoline and a substitute fuel. if gas costs $3.25 per gallon and the substitute fuel costs $2 per gallon, what percent of mixture must

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Question 986440: an automobile engine can run on a mixture of gasoline and a substitute fuel. if gas costs $3.25 per gallon and the substitute fuel costs $2 per gallon, what percent of mixture must be substitute fuel to bring the cost down to $3.00 per gallon?
Answer by stanbon(75887) About Me  (Show Source):
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an automobile engine can run on a mixture of gasoline and a substitute fuel. if gas costs $3.25 per gallon and the substitute fuel costs $2 per gallon, what percent of mixture must be substitute fuel to bring the cost down to $3.00 per gallon?
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Equation for on2 gallon of mixture::
3.25x + 2(1-x) = 3.00
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325x + 200 - 200x = 300
125x = 100
x = 0.8 gallons (amt of $3.25 gasoline)
1-x = 0.2 gallons (amt of $2.00 gasoline)
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Ans: 0.2 = 20% substitute fuel
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Cheers,
Stan H.
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