Two things. 1) I wouldn't say this in English this way, it is awkward. Even if the big cake was only in one of three known locations and I wanted to know "which place" it was, I would feel more comfortable saying "Where is the big cake?" The exception would be if the cake was inside of one of several smaller containers, then I would say, "In which box/bag/stomach is the big cake? 2) I try not to end my sentences in English with a preposition. Therefore a more grammatically correct sentence (notwithstanding my first point) would be: "In which place is the big cake?" Cheers! -Michael
If one was at a cake baking contest, one might ask,"In which place is the big cake".
I submitted "Which place is the big cake" as my answer and I got it right. I hope I dont get it marked wrong later. But I do hope I remeber how it should be written.