Question

На покраску 7м.кв. поверхности требуются 1кг краски. Сколько краски нужно, чтобы покрасить 4м.кв. 9м.кв. 18м.кв.

Answer 1

Ответ:

4/7 кг на 4 м. кв.; 1 2/7 кг на 9 м. кв.; 2 4/7 кг на 18 м. кв.

Пошаговое объяснение:

Составим пропорции:

7 м. кв. - 1 кг

4 м. кв. - х кг

Прямая пропорциональная зависимость

х=(4*1)/7=4/7 кг - на 4 м. кв.

7 м. кв. - 1 кг

9 м. кв. - х кг

Прямая пропорциональная зависимость

х=(9*1)/7=9/7=1 2/7 кг - на 9 м. кв.

7 м. кв. - 1 кг

18 м. кв. - х кг

Прямая пропорциональная зависимость

х=(18*1)/7=18/7=2 4/7 кг - на 18 м. кв.

Answer 2

Calculating Paint Needed

To calculate the amount of paint needed, we can use the ratio of the area to the amount of paint required.

Given that 1 kg of paint is required for 7 square meters, we can calculate the amount of paint needed for each surface area.

- 4 square meters: - Using the ratio, we can calculate the amount of paint needed for 4 square meters. - 4 square meters is 4/7 times the amount of paint needed for 7 square meters. - Therefore, the amount of paint needed for 4 square meters is (4/7) * 1 kg.

- 9 square meters: - Similarly, the amount of paint needed for 9 square meters is (9/7) * 1 kg.

- 18 square meters: - The amount of paint needed for 18 square meters is (18/7) * 1 kg.

Let's calculate these values.

Using the given ratio, we can calculate the amount of paint needed for each surface area.

For 4 square meters: (4/7) * 1 kg = 0.57 kg.

For 9 square meters: (9/7) * 1 kg = 1.29 kg.

For 18 square meters: (18/7) * 1 kg = 2.57 kg.

So, to paint 4 square meters, 0.57 kg of paint is needed; for 9 square meters, 1.29 kg is needed; and for 18 square meters, 2.57 kg is needed.