Iam a 3-digit number that is even. my hundreds and ones digits are the same and have a sum of 8. my tens digit is 2 less than my ones digit. what number am i ?

Let's start off with some key terms.

The number has 3 digits.
Even numbers end with 0, 2, 4, 6, or 8. (Obviously)

The hundreds digit and ones digit are the same.
First number in a 3 digit number is the hundreds, and the last number is the ones.

So, both of those two digits are the same and has to equal 8.

Well, 

The hundreds place and the ones place are 4.

The tens digit is the middle number in a 3-digit number.

 It is two numbers less than the ones digit.


The number is 424.