Answer:
Volume of the aquarium is 900,000cm³ or 0.9m³ and 720 litres would make the tank reach 80%
Explanation:
150 x 80 x 75 = 900,000cm³ or 0.9m³
This could fit 900 litres
And 80% of 900 is 720
So 720 litres added would make the tank reach 80%
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