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Every theoretical problem asks for an answer or solution. Trying to find a solution to a problem is known as problem solving. That is, a problem is a gap between an actual and desired situation. The time it takes to solve a problem is a way of measuring complexity.[1] Many problems have no discovered solution and are therefore classified as an open problem.

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Usually, the substance present in a greatest amount is considered as the solvent. Solvents can be gases, liquids, or solids. The solution that forms has the same physical state as the solvent. Solute may also be gases, liquids, or solids.


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