20kg/s of air at 300C and a humidity ratio of 0.01kg water vapour/kg air the mixed with 12 kg/s of air at 380C and a humidity ratio of 0.02 kg water vapour/kg air. If there is no external addition or removal of moisture and heat, determine the temperature and humidity ratio of the resultant air steam from first principles. Indicate the process on a psychrometric chart.