Answer:
9 ounces
Explanation:
To determine the number of ounces of zinc needed to make the alloy, we can use the fact that the alloy is composed of 75% copper and 25% zinc by weight.
Given that you have 27 ounces of copper, we can calculate the total weight of the alloy using the weight percentage composition.
Weight of copper = 27 ounces
Weight of the alloy = (Weight of copper) / (Percentage of copper) = 27 / 0.75 = 36 ounces
Since the alloy is composed of 75% copper and 25% zinc, we can calculate the weight of zinc in the alloy.
Weight of zinc = (Percentage of zinc) * (Weight of the alloy) = 0.25 * 36 = 9 ounces
Therefore, you would need 9 ounces of zinc to make the alloy.