Tujuan mereka apa? - would this also work?
Yes, that should also work.
Thanks! Just want to say that I've seen a lot of your comments in this Indonesian course and I have always found them useful and helpful. Keep up the good work! :)
Why not "Apakah tujuan mereka?"
"apakah" should be okay as well.
I thought apakah is for a yes or no question only
Apakah tujuan mereka =
is their goal?
Apakah used for yes or no questions, hence "apa" must be used.
Why noy "Apa yang tujuan mereka"?
Nouns as objects, where what/apa replaces the subject. If there are double subjects you can use yang. Apa yang mereka tuju: what (goal) do they want