Which of the following statements is incorrect for a solution saturated with AgCl and AgBr if their solubilities in moles per litre in separate solutions are x and y respectively ?

AgCl⇌  Ag+ + Cl-      AgBr⇌   Ag+ + Br-                   x            x                            y         y                  (x + y)    x                        (x +y)   y So     Ag+ = Br- + Cl-(Since Ag is common.)