How can you fix a carpet of size 20*20 in a room 0f 16*25 by dividing carpet into just two parts

Take the original piece which is 20 unit x 20 unit and cut it from the left side to the right as shown.

Now you have two parts - the left part and the right part. Move the right part 5 units to the left, and 4 units down. They would fit perfectly to form a 16 x 25 piece !