So these are ants found "inside" the cake? Would we say "Apa semut di atas kue itu"?
in the cake, on the cake, at the cake, the ants are everywhere..LOL...
di atas kue…..hmmm...yeah you can leave out "atas".
Unless you want to be specific about which part of the cake.
But hey...you know how ants are, if they smell sweet stuff they're all over it in no time.