Three liquids of densities \(d,\) \(2d\) and \(3d\) are mixed in equal proportions of weights. The relative density of the mixture is: 

1. \(11d \over 7\) 2. \(18d \over 11\)
3. \(13d \over 9\) 4. \(23d \over 18\)
Subtopic:  Properties of Fluids |
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