Write down all of the #'s on a piece of paper
18,23,15,16,15,17,22,16,19,11,24,14,12,16,20,18,14,13,21,11
Put them in order
11,11,12,13,1414,15,15,16,16,16,17,18,18,19,20,21,22
Cross em off on eah side until you reach the middle
16, 16
Since there's 2 instead of 1 middle # Add up the 2 (16+16 = 32)
Then divide by 2 (32/2 = 16)
You're answer is 16