Answer:
8 times
Step-by-step explanation:
If the side length of the smaller cube is "s", then its volume is ...
V₁ = s³
and the side length of the larger cube will be 2s. Its volume will be ...
V₂ = (2s)³ = 8s³ = 8·V₁
This is 8 times the volume of the smaller cube. Since the cubes have the same density, the weight is proportional to the volume. That means the weight of the larger cube is 8 times the weight of the smaller cube.