Question

En esta clase hay ____ veinte personas.

should it be un, una, unas, or no article?

Answer 1

unas

Answer 2

I would say no article.. It translates to In this class there is/are 20 people.

Answer 3

unas

Answer 4

no article because there is "hay" meaning is/are and then "veinte personas" meaning 20 people. so you wouldn't say "there are some 20 people" you'd just say "there are 20 people"

Answer 5

"un" is singular and masculine.
"unas" is plural and you'd think its feminine and it is, but it can be used when speaking about a group of people. Not necessarily female.

So as @caleighgirl16 said, it would say "There are some 20 people." which really doesn't make much sense.

So its, no article.