Question

Сплав состоит из 5 частей меди и 3 частей цинка (по массе). Какова масса меди и какова масса цинка в 2 4/5 кг сплава?

Answer 1

2  4/5 кг = 2,8 кг 
5+3= 8 частей
2,8:8= 0,35 кг   приходится на одну часть
0,35*5= 1,75 кг меди
0,35*3= 1,05 кг цинка

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: - The alloy consists of 5 parts copper and 3 parts zinc by mass. - The total mass of the alloy is 2 4/5 kg.

Calculating the Mass of Copper:

To find the mass of copper in the alloy, we can use the ratio of copper to the total parts (copper + zinc) and then multiply it by the total mass of the alloy.

Mass of Copper: 5 parts copper out of 8 parts total (5 parts copper + 3 parts zinc) by mass. Let's calculate the mass of copper in the alloy: - Mass of copper = (5/8) * 2 4/5 kg

Calculating the Mass of Zinc:

Similarly, to find the mass of zinc in the alloy, we can use the ratio of zinc to the total parts (copper + zinc) and then multiply it by the total mass of the alloy.

Mass of Zinc: 3 parts zinc out of 8 parts total (5 parts copper + 3 parts zinc) by mass. Let's calculate the mass of zinc in the alloy: - Mass of zinc = (3/8) * 2 4/5 kg

Results:

After performing the calculations, we find: - Mass of Copper: (5/8) * 2 4/5 kg = 1 5/8 kg - Mass of Zinc: (3/8) * 2 4/5 kg = 15/8 kg

Therefore, the mass of copper in the alloy is approximately 1 5/8 kg, and the mass of zinc in the alloy is approximately 15/8 kg.