Heat loss from a house

1. The problem statement, all variables and given/known data

I’m struggling to understand question 1.C
How do I incorporate Tw and later eliminate this?

2. Relevant equations

-k*A*(ΔT/ΔX)

3. The attempt at a solution

For 1.a I used this equation: -k*A*((Tinside-Toutside)/thickness wall) I thought to put T inside first as they ask for the inward heat flow and that will be negative (heat loss)….

For 1.c I’m really stuck…

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