2nd grade
posted by damien on .
The sum of my ones digit and tens digit is 10. My tens digit is les than my ones digit and both my digits are prime. i am a prime number. what number am i?

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Lets say the number is AB
so A+B=10
we also know that A<B
and both A and B are prime
so possibilities for A and B are
1,2,3,5,7
if A<B then A can only be 1,2,3,or 5
the only pairs such that A+B=10
are 55, 37
of these two only 37 is a prime number
But check the logic! 
1

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