The question is underspecified. As it stands, y can have any value.
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25cm x 25cm = 625cm
The volume of the gold bar is not affected by such a physical deformation and remains at 525 cm3 and so the density is unchanged.
volume = depth x length x width or volume = depth x area Your area is 1m² and your depth is 25cm or 0.25 m so.... Volume = .25m x 1m² = .25 m³
A = bh (multiply length x width).
To find the volume, multiply by the height x length x width. 7 x 5 x 21 = 735