How you do it is 2 + 1 equals 3 and 6+0 equals 6 so put them together and makes 36 and you have worked it out!
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-20
52
Add them up. 16, 18, 20, 21, 22, 24
The composite numbers in that range are 10, 12, 14, 15, 16, 18, 20. I don't know if you're including 10 and 20 or not. Add them up however you like.
n + 20 - 17 + 13 - n = 20 - 17 + 13 = 3 + 13 = 16