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A vessel contains oil (density = 0.8 g//...

A vessel contains oil (density `= 0.8 g//cm^(3)`) over mercury (density `= 13.6 g//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 `g//cm^(3)` is

A

12.8

B

7.2

C

6.4

D

3.3

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