Tuesday, 1 November 2011

Prime numbers

When my teacher was asked about his age, he answered:
 “My age number is a prime number*, but if you reverse the digits the new-formed number can be divided by 5. Moreover, I wish I live up to this age”.
Can you find my teacher’s age?

*prime number is a number that can be divided only by 1 and itself e.g. 11 is divided only by 1 and by 11.

Πρώτοι αριθμοί
Όταν ο δάσκαλός μου ρωτήθηκε για την ηλικία του, απάντησε:
«Η ηλικία μου είναι πρώτος αριθμός αλλά, αν αντιστραφούν τα ψηφία διαιρείται με το 5 και ελπίζω να ζήσω τόσα χρόνια».
Πόσων χρονών είναι ο δάσκαλος;

6th grade, 13th primary school of Drama, Greece


  1. He is 59 years old.

  2. he is 59 years old

  3. Good work from the two anonymous :)
    You can always write your name or your school, if you like.

    6th grade, 13th primary school, Drama, Greece

  4. he is 59 years old