Two 5 molal solutions are prepared by dissolving a non-electrolyte non-volatile solute separately in the solvents X and Y. The molecular weights of the solvents are $M_x and M_Y$, respectively where ${\mathrm{M}}_{\mathrm{X}}=0.75{\mathrm{M}}_{\mathrm{Y}}$ . The relative lowering of vapour pressure of the solution in X is ‘m’ times that of the solution in Y. Given that the number of moles of solute is very small in comparison to that of solvent, the value of ‘m’ is