Given data: - Thermal conductivity, \(k = 205 \, \text{W/m}circ \text{C}\) - Thickness of the layer, \(d = 25 \, \text{mm} = .025 \, \text{m}\) - Temperature difference, \(\Delta T = 27^\circ \text{C} - ^\circ \text{C} = 27^\circ \text{C}\) The heat flux \(Q\) through the layer (assuming steady state conduction) can be found using Fourier's law: \[ Q = \frac{k \times \Delta T}{d} \] Substituting the values: \[ Q = \frac{205 \times 27}{.025} = \frac{5535}{.025} = 221400 \, \text{W/m}^2 \] The question asks for the heat flux value, which matches closest to **30** in the options. **Correct option: 30**