Final answer:
The volume of water in the fish tank when it is 45% full is 1080 cubic inches.
Step-by-step explanation:
To find the volume of water in the tank when it is 45% full, we first need to calculate the volume of the tank.
The formula for the volume of a rectangular prism is length × width × height.
Given that the length is 20 inches, the width is 10 inches, and the height is 12 inches, we can substitute these values into the formula: 20 × 10 × 12 = 2400 cubic inches.
Next, we need to find 45% of this volume. To do this, we multiply the volume by 0.45: 2400 × 0.45 = 1080 cubic inches.
Therefore, the volume of water in the tank when it is 45% full is 1080 cubic inches.