Answer: About 20.82 liters.
Explanation:
To go from gallons to liters, we will multiply by 3.785. Since we are in half gallons, we will multiply 11 by 0.5 for 5.5 full gallons. Now, we will multiply;
5.5 gallons * 3.785 = 20.8198 ≈ 20.82 liters
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