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Algebra/Math

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Can you show work por favor? :)
A metalworker has a metal alloy that is 20% copper and another alloy that is 60% copper. How many kilograms of each alloy should be combined to create 80 kg of a 53% copper alloy?

  • Algebra/Math -

    Ok, so you have x as the kg.

    The equation should look like this:

    .20(x) + .60(80-x) = .53(80)

    Then you can multiply everything out to solve for x.

  • Algebra/Math -

    What is the factor (x to the third power + 4x to the second power)(2x+8)?

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