Are there languages where nouns are invariable? As I have read such languages simply use a numeral in front of the unchanged noun. They don't say "five cats", but "five cat" or "five tail cat".
I would like to have more information. Which South-East Asian languages use such a system. Examples would be good.
Added: Now I have some information about Indonesian: English two cakes is Indonesian two cake. If there is no numeral before the noun the plural is expressed simply by saying cake two times: cakes is cake-cake. Source:http://forum.thefreedictionary.com/postst143558_Writing.aspx?find=unread Priscilla, an Indonesian woman, talking about numerus in her language. Read her fourth answer.