You have at your disposal a large number of tiles like the one shown below. If you were to take these tiles and try to make a square, what is the fewest number of tiles you'd need?
Since the tiles have a different length and width, you'll need to find a number that can be divided by both dimensions. Of course, the puzzle doesn't end there. You'll need to do a little creative thinking in order to find the fewest number of tiles that allow you to form a square.
Don't forget the puzzle also gives you the thickness of the tiles.
As the sides of the tiles are 10 and 12 inches long, the smallest common multiple of the two works out to 60. Therefore, you'll need to arrange a 5x6 tile square. That's a total of 30 tiles. Simple, right? Too simple, in fact. There's a way to make a square using even fewer tiles.
That's not the answer.
Try approaching the puzzle from a different angle and see where that takes you.
Good work! The key to this problem is realizing that the tiles have depth to them. Once you understand that you have a third dimension to work with, the rest should fall into place for you.
Die Lösung ist: 20.