A room is 5m long 4.5 m broad and 3.5 m high . Find the area of the four walls, if the area of windows and doors account for one fifth of the area of the wallss
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area of 1 walls=l×b×h
=5×4.5×3.5=78.75
now area of 4 walls =78.75×4
=315
but it is given that 1/5 area is covered by doors and window
so, total area is
315-315/5
=315-63
=252
=5×4.5×3.5=78.75
now area of 4 walls =78.75×4
=315
but it is given that 1/5 area is covered by doors and window
so, total area is
315-315/5
=315-63
=252
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