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Some sand is poured into a two liter bottle and the cap is screwed on. Then...

Some sand is poured into a two liter bottle and the cap is screwed on. Then the bottle is placed in the water and it floats with 63 % of the bottle underwater. If the empty mass of the bottle/cap is 42 g, find the mass of the sand that was added. Recall: 1000 L = 1 m3 and density of water = 1000 kg/m3

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