The area of four walls of a rectangular hall having length 18 m and height 8 m is 448 m2. What is the breadth of the hall (in m)?
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → 10
The four walls of a room form a strip as long as the perimeter of the floor and as high as the room, so their area is \(2(l+b)\times h\).
Area of the four walls: \(2(18+b)\times8=448\)
Half the perimeter of the floor: \(18+b=448\div16=28\)
Breadth \(b=28-18=10\) m