Final answer:
The outdoor temperature cannot be determined based on the given information.
Step-by-step explanation:
The brick wall of a home has a thickness of 25 cm and a total area of 7 m². To determine the outdoor temperature, we need to consider the concept of heat flow through the wall. The rate of heat flow can be calculated using the formula: Rate of heat flow = (Thermal conductivity) x (Area) x (Temperature difference) / (Thickness). In this case, we know the thickness, area, and the indoor temperature. However, we don't have enough information to calculate the outdoor temperature as we don't know the thermal conductivity or the rate of heat flow. Therefore, we cannot determine the outdoor temperature based on the given information.