Numbers are infinitely dense. Between any two rational or real numbers, no matter how close, there are infinitely many numbers.
The idea is to use the formula mass = volume x density. Replace the numbers you know, and solve.
== Density== Mass/ Volume ==
Numbers have neither mass nor volume. So numbers do not have density and so cannot be ordered by density.
In the SI system the unit of density is kilograms per cubic meter.
Density = Mass/ Volume
Density = Mass/Volume.
Density = mass/volume ============================
density = mass / volume
Density = mass / volume
density = mass/volume
Mass = Density -------- volume
Density= mass/volume