Mathematics

the sum of all digits in each pair is 19 and the sum of the numbers in each pair is 100.

I don't understand what the question is trying to ask? Is it to find that number, or?

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  1. first thing I want to know, is: which pairs?

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  2. Some candidates are

    36 64
    53 47
    ...

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  3. that's the thing. they don't list any pairs.

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  4. well, just pick any 2-digit number, uv
    The 2nd number will be (9-u)(10-v)

    so, these are also good:

    22 78
    88 12
    ...

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  5. ok. thanks for the help.

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