An alloy weighing 30 lbs. is 11% tin. The alloy was made by mixing a 15% tin alloy and a 9% tin alloy. How many pounds of each alloy were used to make the 11% alloy?
(See answer below)
x = lbs of 15% alloy
30 - x = lbs of 9% alloy
0.15x + 0.09(30 - x) = 0.11(30)=3.3
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