Question

Сплав состоит из 5 частей меди и 3 частей цинка (по массе).Какова масса меди и какова масса цинка в 2 целых4/5 кг сплава?

Answer 1

Медь -5 частей 
Цинк-3 части 
Всего 2 4/5 
Составляем уравнение 
5x+3x= 2 4/5 
8x=2 4/5 
x=2 4/5: 8=14/5:8/1=14 X 1/5 X 8=14/40=7/20
X=7/20
Медь (5) частей =7/20 x 5=7/20 x 5/1=7x5 / 20x/1=35/20=115/20=13/4 
Цинк (3) части =7/20 x 3=7/20 x 3/1 =21/20=11/20
Ответ  медь -13/4 (кг)  цинк - 11/20  (кг) 
Удачки в учебе!)

Answer 2

Calculating the Mass of Copper and Zinc in the Alloy

To calculate the mass of copper and zinc in the alloy, we can use the given ratio of 5 parts copper to 3 parts zinc by mass.

Given: - 5 parts copper - 3 parts zinc

Let's calculate the mass of copper and zinc in 2 4/5 kg of the alloy.

Mass of Copper:

The mass of copper can be calculated as follows: - Total parts = 5 (copper) + 3 (zinc) = 8 parts - Mass of copper = (5 parts / 8 parts) * Total mass of the alloy

Mass of copper = (5 / 8) * 2 4/5 kg

Mass of Zinc:

The mass of zinc can be calculated as follows: - Total parts = 5 (copper) + 3 (zinc) = 8 parts - Mass of zinc = (3 parts / 8 parts) * Total mass of the alloy

Mass of zinc = (3 / 8) * 2 4/5 kg

Let's calculate the values.

Calculation:

- Total mass of the alloy = 2 4/5 kg = 2.8 kg

Mass of copper = (5 / 8) * 2.8 kg Mass of zinc = (3 / 8) * 2.8 kg

Results:

- Mass of copper = (5 / 8) * 2.8 kg = 1.75 kg - Mass of zinc = (3 / 8) * 2.8 kg = 1.05 kg

Therefore, in 2 4/5 kg of the alloy, the mass of copper is 1.75 kg, and the mass of zinc is 1.05 kg.