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How much water should be filled in a con...

How much water should be filled in a container 21 cm in height, so that it appaers half filled when viewed from the top of the contaier?
[Given that : `""_(a) mu _(w) = (4)/(3)` ]

A

8.0 cm

B

10.5 cm

C

12.0 cm

D

14.0 cm

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