Answer
3257 mg is the greater mass.
Work Step by Step
3257 mg = 3257 * $10^{-3}$ g = 3.257 g
0.000475 kg = 0.000475 $10^{3}$ g = 0.475 g
3.257 g is bigger than 0.475 g, so 3257 mg is the greater mass.
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