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There is a cavity of radius r present in...

There is a cavity of radius r present in a sphere made of concrete of radius R. The cavity is filled with sawdust. The sphere floats just immersed in water. The specific gravities of concrete and sawdust are 2.4 and 0.3 respectively. What is the ratio of the masses of concrete and sawdust?

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The correct Answer is:
`8 : 1`
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