A man is trapped in a room. The room has only two possible exits doors. Through the first door there is a room constructed from magnifying glass. The blazing hot sun instantly fries anything or anyone that enters. Through the second door there is a fire-breathing dragon. How does the man escape?
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?
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?