Doubt from Thermodynamics

(ii) part

In 12th question (1st part)...can't we just apply n= n1+n2 to get answer..because they mentioned that the vessels have been connected?? (Where n==number of moles)..but not giving ans..

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Is the answer for first question (T_A >T_B)

Sorry for the wrong answer
I got this T_B=4T_A-T_0
So that gives T_B>T_A

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