The joke started when a kid said 9 plus 10 is 21. For more on the origins check out huzlers.com/910-21-kid-vine-reportedly-run-away-home-currently-searched-read-goodbye-note/
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If you mean 21% of 360 then it is 75.6
(21 + 21 + 19 + 19)/4 = 20
-nfu did u get this from a joke book??
No, rule 21 is the twenty first rule in the rule book.
completed 20 and entered 21