"Quelle lettre ?"

Translation: Which letter?

[Benjamin_qin]

Does "quelles lettres" sound the same?

[-penguin-]

Yes.

[saburai]

I wonder if it would have accepted "quelles lettres"?

[OregonScholar]

Yes, I found that it accepts both.

[angelo000]

I thought it was LAQUELLE lettre? Does the meaning change if the "la" is dropped?

[lai_mesunda]

Laquelle/Lequel(/Lesquels) = which one(s). Quelle = which. Saying "Which one letter?" has a different meaning from "Which letter?". Laquelle is often used with an "est," if I remember correctly: "Laquelle est ma robe?"; "Laquelle est ta fille?". If it goes straight to the noun, use quelle: "Quelle animal?"; "Quelle livre?" :D

[Duomail]

“Quel“ is for masculine nouns like “animal“ and “livre“. Quel livre?

[caroAD]

Is there a difference between the usage of "what letter" and "which letter"? Both could be translated as "quelle"?

[feyMorgaina]

Yes, in French "Quelle lettre?" means both "What letter?" and "Which letter?" Context would be needed to understand which the speaker means.

DuoLingo does accept "What letter?" as a translation, as it should.

As for context, these example dialogues in English should help:

A: Did you see the letter? B: (not seeing any letters anywhere nearby) What letter?

or

A: Did you see the letter? B: (seeing some letters) Which letter?

[caroAD]

Thank you :D

[lai_mesunda]

In English, they have different connotations. I'm not sure about the French translation, though Duo doesn't seem to accept it, which probably means they're also different in French.

[Ash2of6]

In english you might say, for example

A. Did you see the letter?
B. What letter?
C. That one,

You couldn't really exchange what for which in that context, i am not sure it is the same in french.

[darkavenue]

Why is it accepting " What letter" as correct?

[feyMorgaina]

Because it is. "Quel/quelle/quels/quelles" translates as both "which" and "what".

[JewishPolyglot]

Thanks! I was wondering that also

[subpleiades]

Why is 'French' a hint for 'lettre'? In which context would this be used?

[trespetitefille]

What about Quel lettre

[YahyaZuhair]

In French which must match the subject in gender and number.
"Quel" -> goes with masculine subject.
"Quelle" -> goes with feminine subject.
"Quels" -> goes with masculine subjects.
"Quelles" -> goes with feminine subjects.

Lettre is a feminine subject, therefore we use "quelle" to ask about it.