Asked by anon

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?
Answered by Steve
first thing I want to know, is: which pairs?
Answered by Steve
Some candidates are

36 64
53 47
...
Answered by anon
that's the thing. they don't list any pairs.
Answered by Steve
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
...
Answered by anon
ok. thanks for the help.
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