Question

in a certain chemical, the ratio of zinc to copper is 4 to 11. a jar of the chemical contains 220 grams of copper. how many grams of zinc does it contain? it contains \boxed{} grams of zinc.

Explanation:

Step1: Set up the proportion

Let \( x \) be the grams of zinc. The ratio of zinc to copper is \( \frac{4}{11} \), and we know the copper is 220 grams. So we set up the proportion \( \frac{4}{11}=\frac{x}{220} \).

Step2: Solve for \( x \)

Cross - multiply: \( 11x = 4\times220 \).
Calculate \( 4\times220 = 880 \), so \( 11x = 880 \).
Divide both sides by 11: \( x=\frac{880}{11}=80 \).

Answer:

80