Answer:
Number of wallpaper needed = At/Aw = 355.3/75
N = 4.74 ~= 5 rolls
Step-by-step explanation:
Given;
Length of the room = 12 feet 6 inches = 12.5 ft
Breadth of the room = 10 feet 6 inches= 10.5ft
Height of the room = 8 feet
Window = 4 ft by 3ft
door = 7ft by 3 ft
Wall paper = 30 inches by 30ft = 2.5ft by 30ft
The total area of the walls of the room is;
Area = Area of the four walls - Area of the two windows and a door.
A = 2LH + 2BH - Area of windows and door
A = 2(12.5×8) + 2(10.5×8) - 2(4×3) -(7×3)
A = 323ft^2
Allowing 10% waste, total area of wallpaper needed is;
At = 323 × 1.10 = 355.3ft^2
Area of wallpaper Aw= 2.5×30 = 75ft^2
Number of wallpaper needed = At/Aw = 355.3/75
N = 4.74 ~= 5 rolls
