"Bagaimana mereka?"

Translation: How are they?

[HenriCooks]

would ''bagaimana kamu'' mean something similar to ''apa kabar''?

[orosso]

Bergaimana ~ how about it
Bagaimana ~ how

[Kpereira]

Bagaimana is shown as meaning HOW and WHAT? when do we use APA?

[WayangOrang]

apa = what

[BranchVinc]

Depends on how you mean it.

[BranchVinc]

Bagimana is pronounced bâgēmânâ not bagaimana

[BranchVinc]

This is because i sais ē in B.I.

[Audrey329869]

Is it possible to add "ada" ? Bagaimana ada(lah) mereka ?

[yipivan]

No. Ada means "to exist", while adalah means "to be (equal to)". Neither meaning fits the sentence.