Question

Площадь стен комнаты 30 квадратных метров. Хватит ли 5 рулонов обоев для ремонта этой комнаты, если ширина обоев 50 см., а длина одного рулона 10 м.

Answer 1

50 см = 0,5 м

1) 10 * 0,5 = 5(м²) - площадь одного рулона обоев
2) 5 * 5 = 25 (м²) - площадь 5 рулонов

25 < 30 ⇒ не хватит

Answer 2

Calculating Wallpaper Needed for a Room

To calculate the amount of wallpaper needed for a room, we can use the following formula:

Total Area to Cover = 2 * (length + width) * height

Given: - Room area = 30 square meters - Wallpaper width = 50 cm - Length of one roll of wallpaper = 10 m

Let's calculate the total area to cover and determine if 5 rolls of wallpaper will be sufficient.

Calculation

First, we convert the room area to square centimeters for consistency: - Room area = 30 square meters = 30,000 square centimeters

Now, we calculate the total area to cover: - Total Area to Cover = 2 * (length + width) * height - Total Area to Cover = 2 * (10,000 + 15,000) * 1 - Total Area to Cover = 50,000 square centimeters

Determining the Number of Rolls Needed

To determine the number of rolls needed, we can use the following formula:

Number of Rolls = Total Area to Cover / (Wallpaper Width * Length of One Roll)

Let's calculate the number of rolls needed:

- Number of Rolls = 50,000 / (50 * 1000) - Number of Rolls = 50,000 / 50,000 - Number of Rolls = 1

Conclusion

Based on the calculations, it appears that 5 rolls of wallpaper will not be sufficient to cover the entire room. You would need approximately 50 rolls to cover the entire area.