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Math Help - product pairs

  1. #1
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    Unhappy product pairs

    Question is

    The following numbers are grouped in pairs so the product of each pair is the same

    72 8 24 10 5 45 36 15

    What number is paired with 10
    36 45 24 15 72

    Can the sum be got by either + - / or x or does it have to be the same for each one?
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  2. #2
    MHF Contributor
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    Write 'em down in ascending order: 5,8,10,15,24,36,45,72.
    Should now be apparent...
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  3. #3
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    happy parent now thanks
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