"Which of these crepes do you want?"

Translation: Laquelle de ces crêpes voulez-vous ?

[Linda4406]

And why not "lesquelles"? Numbers aren't specified. You could want 2 out of 4.

[Larry327171]

I agree entirely.

[sisalbichon1]

Agreed, one might want more than one and 'which' is number non-specific

[Ata.Emir]

I wrote "lesquelles des crepes tu veux?" and it was wrong :s