a room measures 12 metres by 8.5 m on the outside.find the area of the floor of the room if the walls are 75 cm thick.

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dont know
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how 15 can u plz show me the solution
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why i tell you answer 
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u all have a wrong ans...
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answer is 73.5 m sq.
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73.5 m2
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A room measures 12m by8.5m on the outside. find the area of the floor of the room if the walks are 75cm thick
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73.5sq m
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73.5 m sq
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Room measures 12 metre by 8.5 metre on the outside find the area of the floor of the room if the walls are 75 thick
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area of room outside = 12 * 8.5
= 102
area of room inside =12 - 1.5m * 2 * 8.5m- 1.5 m *  2
  =(12-3)(8.5-3)
9* 5.5= 44m squared
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