A furnace wall composed of 200 mm of fire brick. 120 mm common brick 50mm

A furnace wall composed of 200 mm, of fire brick. 120 mm common brick 50mm 80% magnesia and 3mm of steel plate on the outside. If the inside surface temperature is 1450 °C and outer surface temperature is 90°C, estimate the temperature between layers and calculate the heat loss in KJ/h-m2. Assume k for fire brick 4 KJ/m-h°C, k for common brick= 2.8 KJ/m-h°C, k for 85% magnesia = 0.25 KJ/m-h°C and k for steel 240 KJ/m-h°C, k

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What to do if we are asked the interface temperature between the fire brick and the common brick but the maximum temperature of the common brick should not exceed a certain number ( say 1015 C )