SOLUTION: If C= the cost of a gallon if gasahol, g= price per gallon of gasoline, a= price per gallon if alcohol, and p% is the percent of gasoline, write a formula for the cost, C, of gasah

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Question 127036: If C= the cost of a gallon if gasahol, g= price per gallon of gasoline, a= price per gallon if alcohol, and p% is the percent of gasoline, write a formula for the cost, C, of gasahol.
Thank you for the help I am starting to understand this stuff.
Answer by josmiceli(6784) (Show Source):
You can put this solution on YOUR website!
You are mixing gasoline and alcohol
(cost of a gallon of gasahol) =
(price per 1 gallon of gasoline)x(fraction of a gallon used)
+(price per 1 gallon of alcohol)x(fraction of a gallon used)
------------------------------------------------------------
If % of gasoline is used, the fraction of 1 gallon
would be
The fraction of alcohol used would then be
The formula for the cost per gallon of gasahol is:
answer
suppose I had:
g = $3 /gal
a = $4 /gal
p = 90

dollars /gal gasahol