What is a number that is between 25 and 50 and the one digit is two less than the tens and is prime

31

This is simple. The tens digit has to be two less than the ones.

The numbers that fit this rule are ...

20 31 42 53

Then, they have to be in between 25 and 50.

The numbers that fit this rule are ...

31 and 42

Then, i has to be prime

31 is the only one that fits all three