Winnie write the following riddle.I am a number between 60 and 100.My ones digit is two less than my tens digit.I am a prime number.Winnie's friend Marci
guessed that her riddle was about the number 79.Why can't 79 be the answer to Winnie's riddle?
You can either be 64, 75, 86, or 97. Only 97 is the one that's prime. The answer to the riddle is 97, so check if 79 is "ones digit is two less than my tens digit".
hope that helped!