The correct answer is NOT 49.
You would think a tray twice as wide and twice as long would hold four times as many glasses. Not so.
If a square tray holds 14 glasses in a row along any one edge, how many will it hold?
Hint: The exact size of the glasses is unimportant. Try this with coins, to simulate the bottoms of the glasses. How many coins can you pack inside a square that is seven or fourteen times the diameter of one coin?