I got a 9F via M10 and F18.10 plus 18 divided by 2 whould be 12.5, so i Shold have gotten a 12 of either gender.If I would have removed the 1 from 18 and then do 10 + 8 diveded by 2, the result should have been 9F or 9M.

Sorry if that doesnt make ANY sense AT ALL.
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Do not brag about yourself, let others praise you. -Proverbs 27:2