An alloy of copper and zinc weighing 60 kg contained x kg of copper, which was the percentage

An alloy of copper and zinc weighing 60 kg contained x kg of copper, which was the percentage of copper in the alloy. After adding 6 kilograms of copper.

Let us determine how many kilograms of copper will be contained in the new alloy of copper and zinc, knowing by the condition of the problem that 6 kilograms of copper were added to the original alloy:

x + 6.

Let us determine how many kilograms the mass of the new alloy of copper and zinc will equal, knowing by the condition of the problem that the mass of the original alloy was 60 kilograms:

60 + 6 = 66.

Let’s determine the percentage of copper in the new alloy:

(x + 6) / 66 * 100%.

Answer: The percentage of copper is (x + 6) / 66 * 100%.