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A piece of brass (Cu and Zn) weighs 12.9 g in air. When completely immersed in water, it weighs 11.3g. Then relative densities of Cu and Zn are 8.9 and 7.1 respectively. The mass of copper in the alloy is
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A 0.5 kg block of brass (density; 
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A body of density d and volume V floats with volume V1 of its total volume V immersed in a liquid of density d1 and the rest of the volume V2 immersed in another liquid of density 
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