# The gas mileage of a car is 28.16 miles per gallon. how many gallons per mile is this?

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We can set up a proportion :

We don't want decimals in a fraction, so multiply

Now simplify:

Back to the equation:

Cross-multiply:

Divide both sides by

**So, the answer is #25/704# or #0.0355# about gallons per mile.**

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28.16 miles per gallon

Written mathematically we have:

28.16 miles = 1 gallon

Dividing by 28.16 on both sides we get:

1 mile =

or, 1 mile = 0.0355114 gallons

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An alternate approach...

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We're told that we have a car that uses 1 gallon of gas to go 28.16 miles:

What we want to know is how many gallons per mile:

We already know the ratio,

Describe your changes (optional) 200