The mass of a cube of iron is 355g. Iron has a density of 7.87 g/cm3. What is the mass of a cube of lead w/?

Question

The mass of a cube of iron is 355g. Iron has a density of 7.87 g/cm3. What is the mass of a cube of lead which has the same dimensions?

I don't understand the wording of the problem....And how do I calculate this? Please be clear, don't just show a few numbers

Answer 1

Iron has a density of 7.87 g/cm3, and lead has a density of 11.34g/cm3 (this data must be used as well).
Let the volume of this cube size to be V, we have:
355g/V = 7.87g/cm3...............(1)
Let the mass of a cube of lead to be W, we have:
W/V = 11.34g/cm3...................(2)
(2) / (1) we get:
W/ (355g) = 11.34/7.87
Hence W = (11.34/7.87)*355g = 512g