54. Two ideal gases at absolute temperature

T₁ and T₂ are mixed. There is no loss of energy. The masses of the molecules are m₁ and m₂ and the number of molecules in the gases are n₁ and n₂ The temperature of mixture will be

(a)  (T₁ and T₂ )/2 energy                      (b)  (T₁ and T₂ )/n₁ n₂

(c) (n₁T₁ and n₂T₂ )/ (n₁ +n₂ )              (d) T₁ and T₂

Answer-c