"Bilen er helt ny."

Translation: The car is completely new.

[Intarga]

Why is it "helt ny" and not "hel ny"?

[Deliciae]

"Helt" is an adverb here, and doesn't agree with the car.

[Intarga]

Takk!

[Deliciae]

Bare hyggelig! :)

[wolfofaredsun]

Ah, so in other words the 'helt' is referring to the new nature of the car and not specifically the car itself?

[Ms_World]

Yes.

[JegHeterKordian]

I was wondering if I would type "brand new" would it be correct?

[Deliciae]

Yes, that's one of the accepted translations.