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Question:

Sarah's car gets an average of 27.4 miles per gallon. On average, how far can Sarah drive her car on a tankful of 15 gallons?

A 411 miles
Explaination

Sarah can drive the car 27.4 miles for every gallon. The total for 15 gallons will be 27.4 times 15.
27.4 × 15 = 411
There was one decimal point in the problem, so there will be one decimal point in the answer. The answer is 411.0, or 411[.]