Renuwants to recover large quantity of salt mixed with sand. She added water and stirred well but salt remained undissolved .The undissolved salt remained mixed with sand and could recovered her problem can be solved by

Problem of Renu can be solved by heating the mixture of sand and salt in water. Heating the solution will make the salt soluble in water. All salt will be disolved in water by heating.  Only sand will be remain in the solution. So sand can be separated from the solution. 

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