An even number is a number that can be equally divided into two parts, an odd number, however, can not be divided into two equal parts,.
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The sum of two odd numbers never makes an odd number. Only the sum of an odd number and an even number makes an odd number.
To determine the even or oddness of a number we look at the last digit, in this case it is a one which is an odd number. This makes the number an odd number.
Any odd number can be written as an even number plus one. Any even number plus any other even number makes an even number. Add one makes an odd number. So an odd number plus an even number is always an odd number. Algebraically, any odd number can be written as 2a+ 1 where a is a whole number. Any even number can be written as 2b, where b is a whole number. Add them together, the sum is 2(a + b) + 1, which is odd.
They have only one thing in common. By adding 1 to either an even number or an odd number makes them opposite. (even becomes odd and odd becomes even).
That '5' on the end of it makes it odd. It doesn't matterwhat the rest of the number is.