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The mass of density bottle is 20.0g when empty. 70g when full of water and 55g when full of a second liquid. Calculate the density of the liquid
(take density of water to be 1000kgm−3)

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R.D = mass if substance
Mass of equal volume of water
55-20
    70-20
R.D= 35
         50
Density = 35 x Density of water
                50
=35 x 1000 = 700kg/m3 
  50

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