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I was trying to determine maximum number from list of given integer in problem 8 here (page 5).

So as you see, there are 5 written numbers on paper, and on the wall there is a hanging mirror. We should determine which row contains the largest integer.

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The numbers (as we see them in the mirror) are $8800008$ $8008808$ $8000088$ $8888808$ $8008008$ A mirror flips left and right, so the actual numbers on the paper are $8000088$ $8088008$ $8800008$ $8088888$ $8008008$ Clearly, the middle one (row number 3) is the biggest.

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    @joriki: That's a good point; I guess the correct description is just that the page is reflected, though this seems kind of circular / definitional.2011-06-30