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A goldsmith desires to test the purity o...

A goldsmith desires to test the purity of a gold ornament suspected to the mixed with copper. The ornament weighs `0.25 kg` in air and is observed to displace `0.015` litre of water when immersed in it. Densities of gold and copper with respect to water are, respectively, `19.3` and `8.9`. The approximate percentage of copper in the ornament is

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