How much does 2.5 gallons of water weigh?

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Multiple Choice

How much does 2.5 gallons of water weigh?

Explanation:
Water has a fairly constant density under common conditions, about 8.34 pounds per gallon. To find the weight of 2.5 gallons, multiply: 2.5 × 8.34 = 20.85 pounds. So the weight is about 20.8 pounds. The other numbers don’t fit because they would require using a different amount of water or a different density (for example, 10.4 pounds would be about 1.25 gallons; 18 pounds about 2.16 gallons; 25 pounds about 3 gallons).

Water has a fairly constant density under common conditions, about 8.34 pounds per gallon. To find the weight of 2.5 gallons, multiply: 2.5 × 8.34 = 20.85 pounds. So the weight is about 20.8 pounds. The other numbers don’t fit because they would require using a different amount of water or a different density (for example, 10.4 pounds would be about 1.25 gallons; 18 pounds about 2.16 gallons; 25 pounds about 3 gallons).

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