We present Differential Scanning Calorimetry (DSC) results of rapidly quenched samples of the aqueous solutions of glycerol, propylene glycol and ethylene glycol along with some of their oligomers over a wider concentration. We have critically examined the concentration dependence of glass transition temperature (T-g) of these mixtures. Our results indicate that the Gordon-Taylor equation is not the correct description of the situation. The implication of this finding on the determination of T-g of bulk water from the binary solution data, is discussed. (C) 2008 Elsevier B.V. All rights reserved.