30. A big room is 12m long Sm wide and 5m high. Find the area of its four walls.
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Step-by-step explanation:
What is the area of a room with 12 m long, 7 m wide and 4 m high? The floor area and the ceiling area = 12*7 = 84 sq m. The area of the 4 walls including the window and door openings = 4*2*(12+7) = 8*19 = 152 sq m.
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