Conditioned air at 13oC and 90 percent relative humidity is to be mixed with outside air at

Question:

Conditioned air at 13oC and 90 percent relative humidity is to be mixed with outside air at 34oC and 40 percent relative humidity at 1 atm. If it is desired that the mixture have a relative humidity of 60 percent, determine
(a) The ratio of the dry air mass flow rates of the conditioned air to the outside air and
(b) The temperature of the mixture.