In an alloy of copper and zinc with a mass of 60 kg, x kg of copper was contained.

| July 3, 2021 | education

In an alloy of copper and zinc with a mass of 60 kg, x kg of copper was contained. What was the percentage of copper in the alloy after the addition of 6 kg of copper?

The percentage of substance a% in the alloy is calculated by the formula:

a% = (a / b) * 100%,

where a is the mass of the substance in the alloy, b is the mass of the alloy.

1) Let us express the mass of copper in the alloy after adding 6 kg of copper:

a = x + 6 (kg)

2) Find the mass of the alloy b after adding 6 kg of copper:

b = 60 + 6 = 66 (kg)

3) Let us express the percentage of copper in the alloy:

a% = ((x + 6) / 66) * 100%

This expression will be the answer to the problem, since the initial mass of copper in the alloy in the condition is specified as x, and not a specific numerical value.

Answer: The percentage of copper in the alloy became: ((x + 6) / 66) * 100%.



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