les and des

Question

why is it: ils ont des dollars et des euro. 
Why use des, not les as money is coutable?

Accepted Answer

Ingrid 
Just as in English it would be ' they have (some) dollars and (some) euros', it is ' ils ont des dollars and des euros '. In English 'some' may be left out, but in French ' des ' cannot be left out. 
See attached for more information on partitives and indefinite articles, and also definite articles for specific situations and when 'generalising' about something.
https://progress.lawlessfrench.com/revision/grammar/du-de-la-de-l-are-used-to-express-some-or-any-partitive-articles 
https://progress.lawlessfrench.com/revision/grammar/use-le-la-l-or-les-before-nouns-when-generalising-definite-articles 
https://progress.lawlessfrench.com/revision/grammar/using-le-la-l-to-say-the-definite-articles
 https://progress.lawlessfrench.com/revision/glossary/article-type/indefinite-article