Question
If 4L + 2B + 3H = 228 metres, where L : B : H = 3 : 2 : 1, then the area of 4 walls of the room is
- 1480 m2
- 1440 m2
- 1460 m2
- 1420 m2
The correct answer is: 1440 m2
To find the area of the four walls of the room.
4L + 2B + 3H = 228 metres and L : B : H = 3 : 2 : 1.
H= L/3
B=2L/3.
4L+ 2 x 2L/3 + 3 x L/3 = 228
L = 36
B = 24
H = 12.
Area of room = 2H(L + B ) = 2 x 12(36 + 24) = 1440 sq meters.
Therefore, the area of the room is 1440 sq meters..
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