The correct method to separate the sand and salt from a mixture after the salt has been dissolved in water is:
filtration to collect the sand and distillation to collect the salt.
Here's why:
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Filtration: The sand, which is insoluble in water, can be separated from the solution by passing the mixture through a filter. The sand will be collected on the filter paper, while the salt (in solution) will pass through.
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Distillation: The salt can then be recovered from the saltwater solution by heating it to evaporate the water, leaving the salt behind. This process is called distillation.
So the correct answer is: filtration to collect the sand and distillation to collect the salt.