You are supposed to divide the mass by the volume.
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Density = Mass/Volume = 12/13 g/ml = 0.923 g/ml approx.
density = mass/volume = 15g/2mL = 7.5g/mL
In this case, you need to divide the volume by the density.
Density = Mass/Volume = 64 g/8 ml = 8g per ml.
Density = Mass/Volume = 25.0/100 g/mL = 0.25 g/mL