toute vs toutes

[wanton jewel]

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toute vs toutes

[signal thicket]

Tout is here acting as a pronoun which agrees with the subject « elles ».

[deep vigil]

"tout" is a very hard one, because it can be a noun, an adjective, a pronoun or an adverb and rules change based on its grammatical role.
Here, it's a pronoun, completing "elles" -> "elles toutes", and as such agrees with the subject

[signal thicket]

Ils ont tous dit la même chose.
Elles ont toutes dit la même chose.
but yes, « tout » is difficult as Flynn said

tous not tout, that's singular masc

[stiff trench]

O

Vous ai compris

[deep vigil]

despite that,
Ils ont tout mangé
Elles ont tout mangé

because here it's an adverb, giving information on the verb manger, not on the subject

[fossil echo]

But why toute here not agrees with la meme chose

[signal thicket]

If it were an adjective, it would

but it's not

[deep vigil]

Elles ont mangé tout le gâteau => They ate all of the cake (qualifying and agreeing with gâteau)
Elles ont toutes mangé le gâteau => All of them ate the cake (qualifying and agreeing with elles)