How would you remove the salt from a mixture of sand, salt and marble?

Salt dissolves in water, then you can just filter the grains of sand and marble out. Then evaporate the water to get the salt left behind.

What ever you do don´t use bleach or abrasives or detergent. to eliminate grease stains from marble use organic cleansing soap or white spirit, this might rid maximum stains. Rinse thoroughly with sparkling water and dry rapidly with a chamois leather-based

FIRSTLY ADD WATER TO THE SALT ,SAND AND MARBLE AFTER MIXING FILTER THE MIXTURE THROUGH FILTER PAPER AFTER THIS MARBLES AND SAND WIIL SEPERATE AND NOW WE CAN FIND SALT IN CREASTLE FORM AFTER EVAPORATING SALT SOLLUTION