How does it work (site guessing the hidden number)?

D

Di Da2019-04-01 19:58:28

Mathematics

Di Da, 2019-04-01 19:58:28

vsezdesi.ru/funny/magic/magic.html
I won't explain anything, just look at it strangely.

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L

Lynn "Coffee Man", 2019-04-01
@Di21H

you thought of a double-digit number. Let it be 10a+b. Subtract the numbers a and b from it. We get 10a + b-a-b \u003d 9a (suddenly). Now look at the table carefully. There, all divisors of 9 are indicated by one symbol