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A concrete sphere of radius R has a cavity of radius r which is packed with saw dust. The specific gravity of concrete and saw dust are respectively 2.4 and 0.3 for the sphere to float with its entire volume submerged under water. Ratio of mass of concrete to mass of saw dust will be

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A concrete sphere of radius R has a cavity of radius r which is packed with saw dust. The specific gravity of concrete and saw dust are respectively 2.4 and 0.3 for the sphere to float with its entire volume submerged under water. Ratio of mass of concrete to mass of saw dust will be





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