The part of an iceberg that extends above the water for ice density of 0.9g/cm3
and salted water of 1.1 g/cm3 is
let the volume of the ice be V.
mass ice=.9V
mass of salt water displaced=.9V
volume salt water displaced=mass/density=.9V/1.2=.75V
so 3/4 of the ice is underwater, and 1/4 is above water.