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A vessel contains oil (density =13.6 gm/...

A vessel contains oil (density `=13.6 gm//cm^3`). A uniform sphere floats with half its volume immersed in mercury and the other half in oil. The density of the material of sphere in `gm//cm^3` is:

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The correct Answer is:
`[7.2 gm//cm^(3)]`
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