We know that Ms Salazar's car wastes on average 25 miles per gallon of gasoline.
We also know that she filled the 10 gallon tank with gasoline, before travelling 200 miles. We are going to find the amount of gasoline she will have left, after the journey.
As salazar wastes 25 miles per gallon, we obtain:

and she will waste 8 gallons by travelling 200 miles
This means that she will have left 2 gallons after the journey.
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