"Do you have enough entrances?"
Translation:Har du nok indgange?
You sentence would be more along the lines of "Do you have sufficient/adequate entrances?" This could also refer to the size and quality of the entrances.
If you wanted to use tilstrækkelig referring only to number, you could say: "Har du tilstrækkeligt mange indgange" ("Do you have sufficiently many entrances?"). Obviously, though, this shouldn't be accepted here.