3. you have decided to wallpaper your rectangular bedroom. the dimensions are 12 feet 6 inches by 10 feet 6 inches by 8 feet 0 inches high. the room has two windows, each 4 feet by 3 feet and a door 7 feet by 3 feet. determine how many rolls of wallpaper are needed to cover the walls, allowing 10% for waste and matching. each roll of wallpaper is 30 inches wide and 30 feet long. how many rolls of wallpaper should be purchased? * oa. 4 rolls ob. 5 rolls oc. 6 rolls od. 7 rolls oe. 8 rolls

B. 5 rolls

Step-by-step explanation:

The areas of the room, not including the ceiling, are discriminated as follows:

Longer walls: (6 inches equals one foot)

Shorter walls: (6 inches equals one foot)

Window area:

Door area:

Area that will be effectively covered:

Total area to wallpaper:

Amount of paper needed:

That is, the area of a roll of paper is

Number of rolls needed:

rolls

Correct answer is B. 5Rolls

Step-by-step explanation:

12 inches is 1 feet

6 inches is 6/12 feet= 0,5 feet.

12 inches is 1 foot

30 inches is 30/12 feet=2,5feet.

2. Second,you have to calculate the total surface where you will wallpaper.

So you have to calculate the dimension of 2 different rectangles and substract the surfaces that you don't have to wallppaper (door and windows).

3. Now we have to calculate the area to substract from the total area, since you will not wallpaper the door and windows:

4. Total area to wallpaper is Total surface of the room minus door and windows surface:

5. Now you have to add 10% waste to the calculated surface:

6. So, you have the real area that will wallpaper considering 10% waste, it is 326.23 square feet. To calculate how many rolls you will need, you have to calculate the surface that each roll covers and then divide total surface by roll surface.

7. As the number of rolls is not integer you have to round, then the answer is you will need 5 rolls of wallpaper.

you would 18 *0.25 = 4.5