A room is 6m long,5m wide and 3m high.If the total area of the door and windows is 4平方米,find the total area of the walls inside the room?

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• A room is 6m long,5m wide and 3m high.If the total area of the door and windows is 4平方米,
• A room is 6m long,5m wide and 3m high.If the total area of the door and windows is 4平方米,find the total area of the walls inside the room?
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