"What is the currency in Poland?"

Translation: Jaka jest waluta w Polsce?

[Danuta341703]

The placement of 'jest' shouldn't matter, right? Isn't 'jaka waluta jest w Polsce' also correct (however maybe not the best option)?

[Gerardd88]

In this case it's totally fine (I think I'd even prefer your version :)). However, these are the only two possible places where jest can be in this sentence.

[Jellei]

Added.