How do you find the molality of this problem?

You have prepared a solution composed of 77.00 percent ethanol (C2H5OH; density, 0.789 g/mL) and 23.00 percent water by m (the molar mes of ethanol and water are and 46.07 and 18.02 g/mol). The concentration of the solution expressed as the molality of water in ethanol is: