Preparing a solution by adding to a fixed volume Volume in mls of weaker solution % Concentration of stronger solution % of desired final solution % concentration of weaker solution Preparing a solution with a fixed final volume % Concentration of weaker solution % Concentration of stronger solution % of desired final solution Final volume desired (mls)solution   

% Concentration of stronger solution               mls of stronger concentration to use                % Concentration of weaker solution                      % Concentration desired of final solution

Preparing a solution based on volume of stronger solution