How many even numbers between 17 and 39?

There are 11 even numbers between 17 and 39. To find this, we first determine the even numbers between 17 and 39 are 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, and 38. We can calculate this by subtracting the first even number (18) from the last even number (38) and then adding 2 (since we are counting inclusive of both endpoints).