# science

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A relative density bottle has a mass of 40g when empty, 90g when filled with water and 80g when filled with oil. Calculate the relative density of the oil.

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mass of empty bottle equals 40g
filled with water equals 90g
filled with oil equals 80g
90-40
50

80-40
40
R.D
40/50
0.8 density of the oil
Remember relative density has no unit

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