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In comparing the separation methods for mixtures of salt dissolved in water and sand mixed with water, the method that is common to both is evaporation.
Here's how each method applies to the mixtures:
1. Salt dissolved in water: The mixture can be separated by evaporating the water, leaving behind the salt crystals.
2. Sand mixed with water: Filtration is commonly used to separate sand from water, where the sand particles are retained by a filter while the water passes through. After filtration, evaporation can be used to recover the water from the filtrate if needed.
Therefore, the correct answer is c. evaporation.