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Let V be the volume of the duck. The density of water is 1000kg/m^3

Then the weight of displaced water = (0.25V)(1000kg) = weight of duck

The mass of the duck is (0.25V)(1000) = 250V .

The density of the duck is

P = m/v = 250V/V = 250 kg/m3 (Each V cancels out)

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