Consider the reaction when aqueous solutions of copper(ii) nitrate and nickel(ii) chloride are combined.

Answer : The reaction that will occur when you combine the aqueous solutions of copper nitrate with nickel chloride is a displacement reaction.

It explained below with the reaction :-

Explanation : 

The reaction will give the major product as copper chloride in the form of solid. Rest all the ions will  remain in the aqueous form.

So what you would do is go through and add 3 teaspoons(tsp) 6 times because of the 6 tablespoons(tbsp). which will give you an answer of 18. another way is to multiply 3x6=18.