About two cups full.
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The density would be 25/500 =0.05 g/mL This is a totally unlikely result since the rock has roughly one twentieth the density of water!
The volume is still 100 ml: the shape does not affect the volume.
The water will rise by the volume of the brass: volume = mass/density = 129g / 8.56 g/ml ≈ 15.1 ml → final reading ≈ 50.0 ml + 15.1 ml = 65.1 ml
Only if it is water, which has a mass of 1gram per ml volume
Almost exactly 100.00 mL.