Calculate the amount of Zinc needed for an alloy

Question:

If an alloy is composed of 75% copper and 25% zinc by weight, and you have 12 ounces of copper, how many ounces of zinc do you need to make the alloy?

Final answer:

You would need 16 ounces of zinc to make the alloy.

To calculate the amount of zinc needed to make the alloy, we can set up a proportion using the given percentages and the weight of copper.

Let's assume the weight of zinc needed is x ounces.

We can set up the proportion:

75/100 = 12/x

Cross-multiplying, we get:

75x = 1200

Dividing both sides by 75, we find:

x = 16

Therefore, you would need 16 ounces of zinc to make the alloy.