Question

In a certain chemical, the ratio of zinc to copper is 3 to 11. A jar of the chemical contains 429 grams of copper. How many grams of zinc does it contain?

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Answer 1

117 g

Explanation:

The ratio of zinc to copper is 3/11. If it contains 429 grams of copper, we can use proportions to find the mass of the zinc. We can set the unknown mass of zinc to x.

`(3)/(11) =(x)/(429)`

Now we cross multiply:

`3(429)=11x`

Simplify:

`(1287)/(11) =x`

Therefore, the mass of zinc is equal to 117 grams (three sig figs)