"Kolik odborníků tady pracuje?"

Translation: How many experts work here?

[folshost]

Why is it not "pracujou" here even though odborníků is plural?

[VladaFu]

First, pracujou is informal but now-allowed in spoken (hovorová forma) use, literary form is pracují. But you need singular because of "kolik" after which you use the genitive odborníků. Similarly with numbers. Čtyři lidé pracují, but pět lidí pracuje.

[LukasBlech]

"How many experts have been working here?" is not possible?

[VladaFu]

Je to divný.