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a 10.5-gallon aquarium is 2/3 full. how many more gallons of water does it take to fill the aquarium?

User Prongs
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1 - 2/3 = 1/3. This is the amount of water we want to find out to fill the aquarium.
1/3 = 10.5 divided by 3.
1/3 = 3.5

Answer: 3.5 gallons of water.
User Stephane Martin
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