#### Answer

You will need to know a. the mass in grams of A in each solution and c. the volume of water added to each solution or d. the total volume of the solution

#### Work Step by Step

Concentration is the amount of solute divided the volume of the solution. Therefore, we must know the amount of A we have in each solution. Then, we may use either the amount of water added to each solution or the total volume of the solution to solve for the volume of the solution.