581
Monthly rule
(lemmy.dbzer0.com)
Be sure to follow the rule before you head out.
Rule: You must post before you leave.
Seventeen is 7+10 (seven+teen) but twenty one is 20+1 (twenty+one)
If English was more consistent, seventeen would be ten seven.
If it was really consistent, it would be something like onety seven but not really either, since it's also not twoty seven.
PS: Eleven would be onety one.