How many rolls of wallpaper are required for pasting a room measuring 6x5x3 m, if the dimensions

How many rolls of wallpaper are required for pasting a room measuring 6x5x3 m, if the dimensions of one roll are 0.5×18 m and it is enough to have a margin for trimming, different areas of windows and doors.

The room has the shape of a rectangular parallelepiped. Her opposite walls are rectangular and equal to each other.

The number of wallpapers will be considered for pasting the surface of all walls, without taking away the area of ​​doors and windows.

This amount of wallpaper is needed for the stock.

The room is 6 meters long and 5 meters wide.

We find the area of ​​the walls of the room.

Two walls have dimensions a = 6 m and c = 3 m.

The area of ​​the long wall is equal to:

S = 6 m * 3 m = 18 m2.

The area of ​​the smaller wall is:

S = 5 m * 3 m = 15 m2.

The total area of ​​4 walls is equal to:

S = 2 * 18 m2 + 2 * 15 m2 = 36 m2 + 30 m2 = 66 m2.

The area of ​​the wallpaper roll is:

S = 0.5 m * 18 m = 9 m2.

Divide the area of ​​the walls by the area of ​​the wallpaper roll:

66 m2 / 9 m2 = 7.333 …

Let’s round up to 7.3.

You need as many as 8 rolls.

Answer: 8 rolls.