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algebra investments

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Peter invested some money at 6% annual interest and martha invested some at 12%. If their investments is $6000 and their combined interest was $540. How much money did martha invest?

  • algebra investments -

    Let Peter's investment be x
    then Martha's investment is 6000-x


    .06x + .12(6000-x) = 540
    6x + 12x(6000-x) = 54000

    I am sure you can finish it.

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