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Bronze is a mix, or alloy, of tin and copper. A metal worker needs 100 g of bronze that is 25% tín. He has one tin/copper alloy that is
5% tin and another tin/copper alloy that is 45% tin.
Let x = the number of grams of the 5% tin alloy.
Let y = the number of grams of the 45% tin alloy.
How many grams of each alloy should the metal worker combine?