In the pictures there are two views (front and rear) to the rest of one large cube composed of small cubes. Count number of small cubes that were taken from the original big cube.
In the pictures you see two views (from the front and rear) to the rest of the cube. How many dice were removed from the original 4 x 4 x 4 cube?
The large cube is composed of 4 x 4 x 4 = 64 cubes.
The building is composed of 30 cubes.
64 - 30 = 34 of the cubes have been removed.