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[" 3.A concrete sphere of radius "R" has...

[" 3.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 this sphere to float with its entire "],[" volume submerged under water,find the ratio of "],[" mass of concrete to the mass of saw dust."]

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