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A certain block weighs 15 N in air. But ...

A certain block weighs 15 N in air. But is weighs only 12 N when completely immersed in water. When immersed completely in another liquid, it weighs 13 N. Calculate the relative density of (i) the block and (ii) the liquid.

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The correct Answer is:
[(a) 5, (b) 2/3]
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