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Math Help - primes and divisibility puzzle

  1. #1
    Member
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    Mar 2010
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    primes and divisibility puzzle

    I have attached a problem that is similar to one that i posted earlier. I have worked this one out, but would like to know if what i have done is correct.

    I came up with possible costs:

    total $221.04 @ $9.21 ea
    total $521.04 @ $21.71 ea
    total $821.04 @ $34.21 ea

    I also thought that $x21.08 would be possible too, but it turned out that these possibilities did not work. I was hoping someone could help me understand why.
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