The water in the aquarium is a rectangular prism with dimensions 20, 12 and h (where the height is unknown).
We know that the volume is the product of the dimensions, and that it is 2400, so we have

Answer: Answers and work are all in the picture that I attached. Hope this helps
When you divide 972 by 10.8 you get the answer of 90. Hope this helps :)
The answer is 45.
15% = 0.15, since you move the decimal 2 places
0.15 x 300 = 45.