A water tank is 1/3 full; then, 21 gallons of water are added to the tank, making it 4/5 full. How many gallons of water could the tank hold if it were completely full?

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A water tank is 1/3 full; then, 21 gallons of water are added to the tank, making it 4/5 full. How many gallons of water could the tank hold if it were completely full?

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AnneCviz AnneCviz · Answer 1

AnneCviz AnneCviz

let x be the full capacity of the tank

(1/3)x + 21 = (4/5)x

(4/5)x - (1/3)x = 21

(7/15)x = 21

x = 45

Therefore, if the tank were full, it can hold 45 gallons

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