Question

на покраску 7м² поверхности требуется 1 кг краски. Сколько краски нужно чтобы покрасить 4 м², 9 м², 18 м²?​

Answer 1

Ответ:

7м² = 1кг

1м² = 1/7кг

1м² × 4 = 1/7кг × 4

4м² = 4/7кг

1м² × 9 = 1/7кг × 9

9м² = 9/7кг

1м² × 18 = 1/7кг × 18

18м² = 18/7кг

Answer 2

Calculating the Amount of Paint Needed

To calculate the amount of paint needed to cover a certain area, we can use the given information that 1 kg of paint is required for 7 m² of surface.

- For 4 m²: - To cover 4 m², we can use the proportion: - 1 kg of paint is required for 7 m² - x kg of paint is required for 4 m² - Using the proportion, we can calculate the amount of paint needed for 4 m².

- For 9 m²: - Similarly, we can calculate the amount of paint needed for 9 m² using the same proportion.

- For 18 m²: - We can also calculate the amount of paint needed for 18 m² using the given proportion.

Calculations

- For 4 m²: - Using the proportion, the amount of paint needed for 4 m² is calculated to be approximately 0.57 kg. - This is calculated using the proportion: 1 kg is to 7 m² as x kg is to 4 m². - Source: - For 9 m²: - Using the same proportion, the amount of paint needed for 9 m² is approximately 1.29 kg.

- For 18 m²: - Similarly, the amount of paint needed for 18 m² is approximately 2.57 kg.

So, to paint 4 m², approximately 0.57 kg of paint is needed, for 9 m², approximately 1.29 kg is needed, and for 18 m², approximately 2.57 kg is needed.