Yesterday my brother asked me a question.
Suppose you have a carpet of size $16×9$. Now you have to cut this carpet in such a way that after cutting it and arranging pieces, the dimension is $12×12$. You can only cut the carpet once. You can arrange the obtained pieces in any way you like. How can you do this?
Essentially the same problem appears in Boris Kordemsky's puzzle book, with the solution as below.
