In an alloy consisting of copper and tin, the ratio of the mass of tin to the mass of copper

In an alloy consisting of copper and tin, the ratio of the mass of tin to the mass of copper is 1: 4, what percentage is the mass of each metal in the alloy.

From the condition we learn that in an alloy of copper and tin, the ratio of the mass of tin to the mass of copper is 1: 4, where 1 part is the mass of tin, and 4 is copper.
Since all 5 parts are 100%, 1 part is 1/5 * 100% = 20%.
Then the alloy contains 20% tin and 4 * 20% = 80% copper.
Therefore, our answer: 20% is the mass of tin in the alloy, and copper is 80%.



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