Here is Lewis Carroll's Jabberwocky. Inc. Draw the figure shown without lifting your pencil from the paper, without retracing any edge and without crossing your own path.
Solution Move exactly four of the cakes shown to make five rows with four cakes in each row.
A clock has hour and minute hands of the same length and no numerals on its face. You are given two glasses. One contains 50 tablespoons of milk, the other 50 tablespoons of water. Take one tablespoon of milk and mix it with the water. Solution Find three right triangles with sides of integer length all having the same area.