Question

Winnie wrote 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. What humber does Winnie's riddle describe? Explain.

Answer 1

the answer is 97

Explanation:

because 97 is between 60 and 100, 7 is less than 9, and it is a prime number. it couldn't be 64 because 64 is even, making it a composite number. it also couldn't be 75 because 75 is divisible by 5. it couldn't be 86 because 86 is divisible by 2. 97 is the only one left.