Question

The larger cube’s volume is about blank cm

Answer 1

Volume = mass divided by density.

You are given the mass and density for the smaller cube so you can calculate it's volume:

Volume = 20  / 7.87 = 2.541 cubic cm's.

Now you are told the larger cube has 2 times the volume:

Volume of larger cube = 2.541 x 2 = 5.08 cubic cm's.