A solution is made when solute is dissolved in a solvent. Take a simple scenario for example, a salt solution typically is comprises of a an amount of salt mixed with a certain volume of water. The mixture of both is what makes a salt solution.
In this case, we need to make a solution if sweetened coffee. Prior to now, we know we have a particular coffee which is unsweetened that is has no sugar in it. Now, we are tasked with the responsibility of making a sweetened coffee. Our coffee is without sugar thus will serve as the solvent because it is the carrier medium. The sugar which obviously would dissolve in the solvent to form a solution would be our solute.
Now dissolving it in the unsweetened coffee thus will give us a sweetened coffee solution.
