Hi andyboy179,

if the 3 blocks have identical dimensions,

then their volumes are equal,

so multiplying by 3 would give total volume

(assuming the side with no dimension given is 3 units).

However, one block is on top of another, removing 2 sides from the surface area

and the 2 base blocks are side-by-side removing another 2 sides from the total surface

of the shape.