The length and width of a rectangular prism-shaped aquarium is $5$ ft and $4$ ft, respectively. If the height of the aquarium is $3$ ft, then find its volume.

Q. If a cube of edge length 4 ft is cut from the corners a rectangular prism of length 6 ft, width 4 ft, and height 7 ft as shown, then what would be the total surface area of the resulting shape?

Q. The shape of an aquarium is that of a rectangular prism. It can hold 1800 cubic inches of water. Observe the diagram of the aquarium in the given image and find its height.
{Hint: Volume of a rectangular prism = length$\times$ width$\times$ height}

Q. A rectangular prism-shaped room has dimensions $11$ ft $12$ ft $10$ ft. What will be the percentage decrease in the volume of the room if the height is reduced by $1.5$ ft?

Q. A rectangular pyramid is placed on the top of a rectangular prism of height 7 ft and width one-third of its length. If both have the same base area and the total height of the structure is19 ft, which has a greater volume?