SOLUTION: A new automobile engine can run on a mixture of gasoline and a substitute fuel. If gas costs $3.25 per gallon and the substitute costs 90¢ per gallon, what percent of a mixture mus
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Question 990545: A new automobile engine can run on a mixture of gasoline and a substitute fuel. If gas costs $3.25 per gallon and the substitute costs 90¢ per gallon, what percent of a mixture must be substitute to bring the cost down to $3.00 per gallon? Answer by josmiceli(19441) (Show Source):
You can put this solution on YOUR website! Let = gallons of gasoline used
Let = gallons of substitute used
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I will say that I am filling a 100 gallon
tank with the mixture
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(1)
(2) ( in cents )
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(2)
(2)
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Multiply both sides of (1) by and
subtract (1) from (2)
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(2)
(1)
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and
(1)
(1)
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10.638 % of substitute and 89.362 % of gasoline
must be used
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check answer:
(2)
(2)
(2)
(2)
error due to rounding off
