code: def V_super_stock(self, V_stock, C_super_stock):
          
          return Stock.V_super_stock(self, V_stock, self.C_stock(), C_super_stock)
docs: Return the volume of super (more concentrated) stock that must be
          diluted for the desired stock volume and required stock concentration.
  
          :param V_stock: Volume of the stock of material
          :type V_stock: float
          :param C_super_stock: Concentration of the super stock
          :type C_super_stock: float
  
          :return: Volume of super stock to dilute
          :rtype: float