Understand Volume as Cubic Units Practice Test

Two solids are built from unit cubes (each cube is $1$ cubic unit). Solid A is a complete stack with 2 layers, and each layer has 6 cubes (the cubes fill the space without gaps or overlaps). Solid B is a complete stack with 3 layers, and each layer has 4 cubes (the cubes fill the space without gaps or overlaps). Volume is measured in cubic units. Which claim is correct?

A solid is built from unit cubes (each cube is $1$ cubic unit). The cubes fill the space completely with no gaps or overlaps.

The solid has:

• 3 cubes on the bottom layer
• 3 cubes on the second layer stacked directly on the bottom layer
• 3 cubes on the third layer stacked directly on the second layer

Which statement about the volume is correct? (Volume is measured in cubic units.)