A 0.9-m3 rigid tank is divided into two equal compartments

A 0.9-m3 rigid tank is divided into two equal compartments by a partition. One compartment contains Ne at 20oC and 100 kPa, and the other compartment contains Ar at 50oC and 200 kPa. Now the partition is removed, and the two gases are allowed to mix. Heat is lost to the surrounding air during this process in the amount of 15 kJ. Determine
(a) The final mixture temperature.
(b) The final mixture pressure.