Question

Мастеру необходимо оклеить обоями 2 стены прямоугольной формы. Длина каждой стены 4,2 м, высота 2,5 м. Сколько'рулонов обоев необходимо купить, если в одном рулоне 10 м обоев шириной 0,6 м? Сколько будут стоить все обои, если один рулон стоит 7,80 лата?​

Answer 1

Ответ:

Пошаговое объяснение:

4,2×2,5=10,5м² 1 стена

10,5×2=21м² 2 стены

0,6×10=6м² в рулоне

21÷6=3,5 рулона надо

3,5×7,80=27,30 лата будут стоить обои

Но если брать 4 рулона то

4×7,80=31,20 лата

Answer 2

Ответ:

мастеру нужен 15,16 лата

Answer 3

Calculation of Wallpaper Rolls Needed

To calculate the number of wallpaper rolls needed, we need to determine the total area of the walls and divide it by the area covered by one roll of wallpaper.

The dimensions of each wall are as follows: - Length: 4.2 meters - Height: 2.5 meters

To find the area of each wall, we multiply the length by the height: - Area of each wall = 4.2 meters * 2.5 meters = 10.5 square meters

Since there are two walls, the total area to be covered is twice the area of one wall: - Total area to be covered = 2 * 10.5 square meters = 21 square meters

Now, let's calculate the number of rolls needed. We divide the total area to be covered by the area covered by one roll of wallpaper.

The dimensions of one roll of wallpaper are as follows: - Length: 10 meters - Width: 0.6 meters

To find the area covered by one roll, we multiply the length by the width: - Area covered by one roll = 10 meters * 0.6 meters = 6 square meters

To calculate the number of rolls needed, we divide the total area to be covered by the area covered by one roll: - Number of rolls needed = 21 square meters / 6 square meters = 3.5 rolls

Since we cannot purchase half a roll, we need to round up to the nearest whole number. Therefore, the master needs to buy 4 rolls of wallpaper.