an aquarium holds 6 1/4 gallons of water. the water level has dropped to 4/5 of this amount. how much water should be added to fill the aquarium?

So 1-4/5=1/5 of 6 1/4 gallons of water should be added to fill the aquarium.

6 1/4 *1/5=25/4*1/5=5/4=1 1/4

Therefore 1 1/4 gallons of water should be added to fill the aquarium

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