1.

Three liquids of densities d, 2d and 3d are mixedin equal proportions of weights. The relativedensity of the mixture is

Answer»

Without specifying the proportions, all we know is that it will be somewhere between 1d and 3d.

If, at a guess, the proportions are supposed to be equal in volume, then it will be:

(1d + 2d + 3d) / 3 = 6d / 3 = 2d

If they are supposed to be equal in mass, then it would be:

1 + 1 + 1 / (1/1d + 1/2d + 1/3d) = 3 / (11/6d) = 18d/11



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