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In an old house, a fireplace in the first floor keeps its temperature at a cozy 74 "F, while there is no heating in the two floors above. Assume that

the heat flows vertically. What would be the temperature in the second and the third floor is if the R-value of each floor slab is 8 and the R-value of the roof is 15. The outside3.temperature is 28 F.

Fig: 1