Final answer:
The aquarium will hold 12,000 grams of water.
Step-by-step explanation:
To find the volume of water the aquarium will hold, we need to multiply the length, width, and height. The volume of a rectangular prism (like an aquarium) is calculated using the formula V = lwh, where l is the length, w is the width, and h is the height. In this case, the length is 30 cm, the width is 20 cm, and the height is also 20 cm. Plugging in these values into the formula, we get V = 30 cm x 20 cm x 20 cm = 12,000 cm³. To convert this volume to grams, we need to multiply by the density of water. The density of water is approximately 1 g/cm³. Multiplying 12,000 cm³ by 1 g/cm³ gives us the answer: the aquarium will hold 12,000 grams of water.