Two 5 molal solution are prepared by dissoliving a non elecrtroyte non volatile solute separately in the solvents X nad Y The molecular weights of the solvents are `M_(x) and M_(y)` respecitvely where `M_(x)=3/4 M_(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 :