Question

A mixture of sand and common salt is dissolved in water and then filtered . Name the filtrate and residue .

Answer 1

A  mixture of sand and common salt, that is dissolve in water and then filtered well, that is an impossibility for sand will not dissolve in water.

or:

a mixture of sand, and common salt that is dissolved in water, and then filtered.  

Well that would leave salty water and a residue of sand so, separated substance