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.
A tree doubled in height each year until it reached its maximum height over the course of ten years. How many years did it take for the tree to reach half its maximum height?
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?