The Alphabet Code

You're a mathematician and you're given a code: a = 1, b = 2, c = 3, d = 4...z = 26. Then you're asked to write a letter to Paul Erdős in this code. Every word is a number made by the average of all the numbers that make up the letters of that word. For instance the word "four" would be represented by 15 since $\frac { 6+15+21+18 }{ 4 } =15$ . What would the salutation of the letter look like?