Cs(shear wave)=square roots of G/P

where G are the shear modulus of the elastic materials.

For example, for a typical steel alloy, G = 80 GPa and ρ = 7700 kg/m3, yielding the shear velocity cs is estimated at 3200 m/s using the same numbers...

This paragraph is from wikipedia...i am not understand....

why 80/7700=3200?

Can anybody explain?