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23 May, 05:10

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?

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  1. 23 May, 05:33
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    20 lbs of 9%

    10 lbs of 15%

    Step-by-step explanation:

    x: 9%

    y: 15%

    x + y = 30

    y = 30 - x

    0.09x + 0.15y = 0.11 (30)

    0.09x + 0.15 (30 - x) = 3.3

    -0.06x = - 1.2

    x = 20

    y = 10

    y = 30 - x
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