You are given a mixture of sand, salt, and iron fillings. Suggest some methods for separating all thhe components of this mixture?

FIrstly, bring a magnet near the mixture. As iron being a metal , iron fillings will be attracted towards magnet and they will get seperated.

Secondly, mix the rest of solution in water and let it settle for some time. Sand being insoluble, will settle down and can be seperated by sedimentation and decantation. or through passing through filter paper.

Thirdly, Evaporate this solution left (that is of water and salt) , water will evaporate and sand will be left in the beaker.

thus you can seprate them by bringing magnet, then passing through filter paper, and lastly evaporation.

Iron could be separated through magnetic separation process..

Sand could be separated through filteration or sedimentation and decantation.

Salt could be separated through evaporation process. 

Iron is a magnetic material so it can be separated using magnetic separation. Next fill it with water and use filtration. At last separate salt using evaporation.