Multiples of 9 are: 9, 18, 27, 36, ... The first two multiples are 9 and 18.<br><br>
&bull; First multiple of 9 = 9 &times; 1 = 9<br>
&bull; Second multiple of 9 = 9 &times; 2 = 18<br>
&bull; Sum = 9 + 18 = 27<br><br>
Final Answer: 27