We have shown you a regular water barrel as below. Without using any measuring device can you check if the barrel is more than half-filled or less than half-filled?
You have a square. What you have to do is cut and reassemble the square such that you create a Red Cross sign that has the same volume as that of the square.
How many points are there on the globe where, by walking one mile south, then one mile east and then one mile north, you would reach the place where you started?
What is the four-digit number in which the first digit is one-third the second, the third is the sum of the first two, and the last is three times the second?