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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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