An automobile engine can run on a mixture of gasoline and a substitute fuel. If gas costs $3.45 per gallon and the substitute fuel costs $2 per gallon, what percent of a mixture must be substitute fuel to bring the cost down to $2.29 per gallon? ______%
Unitary Method
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An automobile engine can run on a mixture of gasoline and a substitute fuel. If gas costs $3.45 per gallon and the substitute fuel costs $2 per gallon, what percent of a mixture must be substitute fuel to bring the cost down to $2.29 per gallon?
______%
We can make 10 gal of the mixture and find the percent from that
Let x = amt of 3.45 fuel
then
(10-x) = amt of 2.00 fuel
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