Ken and Sam shared some marbles. The ratio of the number of marbles Ken has to the number of marbles Sam has is
5:3. If Ken's marbles increases by 15%, what percentage of Sam's marbles must be decreased so that the total number of marbles they have remained unchanged?

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  1. k = (5/3) s

    1.15 (5/3)s = new number of kens marbles

    increase in kens marbles = .15 (5/3) s
    = decrease in sam's marbles = .25 s

    (.25 s / s )100 = 25% decrease

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