"The girl is very clever."

Translation: Jenta er svært flink.

[vildeluna]

It is possible to use the word 'smart' too, it should be a possibility so you don't get the answer completely wrong.

[anachron]

I'm not sure if 'smart' would be fine in the English sentence as it has a variety of meanings, but in the Norwegian one it makes perfect sense: "Jenta er svært smart".

[seanrosk]

Or "klok".

[vukmisovic]

Would "ganske flink" work here?

[Deliciae]

No, "ganske" usually translates to 'fairly/pretty/somewhat/rather/etc'.

There are a few exceptions where it can translate to 'completely/absolutely', but those are more or less set phrases, which I suspect even Norwegians misinterpret at times.

The English "quite" has the same dual meaning.

[MassaMolotoV]

Hun Linn er svært flink ;)

[Deliciae]

Haha, takk!

[vukmisovic]

Well that settles it. :D Takk!