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Xcm3 of substance A which has density of 800kg/m3 is mixed with 100cm3 of water with a density of 1000kg/m3. The density of the mixture is 960kg/m3. Determine the value of X 

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Total mass = m1 + m2
m1 = 0.8 x x =0.8x g
m2= 1x100 = 100g
total = (0.8x + 1000)g
total volume = (x +100) = 0.96
                        x+100
x  =   4     
       0.16
    = 25cm  

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