As Professor of the six hours he had to go to a meeting and I'm here in class bored I decided to porporvi a riddle.
Me did it to me yesterday and after 15 minutes of unnecessary calculations and attempts I gave up ... Now it's your turn!
What 'is the number which when multiplied by 4 gives its inverse (inverse means, for example 123 and 321).
I can give you 2 small aid is between 2000 and 2500 and consists of 2 digits and 2 digits odd.
Good luck! If you find a solution post it in the comments.
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