When writing numbers why is Forty the accepted way to write this number

Why is it not written as fourty?
Who makes these rules?

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We live and at a Live concert also pronounced different but spelt the same

  • flower / flour: The bright petals of a plant versus a powder used for baking.
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A door Jamb pronounced ‘Jorm’ what’s that all about then… :thinking:

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I’ve always wondered that … as nine is ninety … not ninty.