The answer to that is simple: 32.
16
+16
_____
32
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16 + 16 + 16 + 17 + 18 + 18 + 18 + 19 + 19 + 20 + 20 + 20 + 21 = 238
32+14+20+18+16+31+21+16=168
48
The answer to 21 plus 16 is 37.
4 plus 8 plus 12 plus 16 is equal to 40.