I think the answer is 18 because 72 divided by 4 is 18. I don't know if it is mph or if its miles per gallon. I don't know, it's one of those two so yah...
Hope this helps. c;
Sara drove 18 miles per gallon of gas.
72 miles ÷ 4 gallons of gas = 18 miles per gallon of gas
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