A model [1] recently proposed for mixed electrolytes-mixed solvent systems was tested for activity coefficients of electrolytes, the transfer Gibbs free energy and the solubilities of electrolytes. The model is comprised of the Debye-Hu¨ckel term, the Born term and the NRTL term similar to Cruz and Renon`s, but has several simplifying features. The model was found applicable to mixed electrolyte-aqueous systems without any interaction parameter between electrolytes. But since the available data are limited, the test for applicability to mixed solvent systems needs further studies.