The area of the 4 walls of a room is 216 m2. The breadth and height of the room are 7.5 m and 6
m respectively. Find the length of the room.
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Answer:
Area of walls = 2 × h ( l + b )
= 2 × 7.5 ( l + 6 )
= 15 ( l + 6 )
= 15 l + 90
=> L = 90/15
= 6
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