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x - 315/21 = 9
Solve for x.
Solve for x.
First, let's calculate the amount of gasoline used to drive 315 miles. We know that the car uses 1 gallon of gasoline for every 21 miles. Therefore, for 315 miles, the car would have used:
315 miles / 21 miles/gallon = 15 gallons
Now let's add the amount of gasoline remaining (9 gallons) to the amount used (15 gallons):
15 gallons + 9 gallons = 24 gallons
Therefore, the gasoline tank holds 24 gallons.