The alloy of copper and zinc contains 12% copper. The mass of the alloy is 1200 g. How much zinc is in the mixture?

Rule: to find a few percent of a number, you must divide that number by one hundred and multiply by the number of percent.

1) Find how much copper is in the alloy:

(1200: 100) * 12 = 144 (g);

2) Find how much zinc is in the alloy:

1200 – 144 = 1056 (g).

Answer: in the alloy 1056 g of zinc.

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