A concrete sphere of radius R has a cavity of radius r which is packed with saw-dust. The specific gravities of concrete and sawdust are 2.4 and 0.3 respectively. The sphere floats with its entire volume sub-merged under water. Calculate the ratio of mass of concrete and the mass of saw-dust

A concrete sphere of radius R has a cavity of radius r which is packed

1.	A concrete sphere of radius R has a cavity of radius r which is packed with saw-dust. The specific gravities of concrete and sawdust are 2.4 and 0.3 respectively. The sphere floats with its entire volume sub-merged under water. Calculate the ratio of mass of concrete and the mass of saw-dust
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