Question

in a certain chemical, the ratio of zinc to copper is 4 to 11. a jar of the chemical contains 495 grams of copper. how many grams of zinc does it contain? it contains 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 have \(\frac{x}{495}=\frac{4}{11}\).

Step2: Solve the proportion for \(x\)

Cross - multiply: \(11x = 4\times495\). Then \(11x=1980\). Divide both sides by \(11\): \(x=\frac{1980}{11}\).

Answer:

\(180\)