If tens digit is two less than ones digit, then ones digit is 2 greater than the tens digit.
The tens digit can be 7 , 8 or 9.
You should discard 8 and 9 because for tens digit 8 the once digit is 10 and for tens digit 9 the once digit is 11.
For a two-digit number that is impossible.
So the tens digit is 7.
It is two less than 9.
So your number is 79.
I am a number between 70-90 my tens digit is two less than my ones digit I am a
prime number what am I
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