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This question is asking how many miles the car has gone since the gas tank was last filled. It gives the information that the gas tank holds 12 gallons and that the car uses 1/20 of a gallon per mile. To solve this problem, we can use the formula:
miles = gallons * (1 / gallons_per_mile)
In this case, we plug in the given values:
miles = 12 gallons * (1 / (1/20 gallon/mile))
Simplifying, we get:
miles = 12 * 20
So the car can go a maximum of 240 miles before it runs out of gas.