These questions are more for entry level workers. But, nevertheless, they are really challenging you to think and analyze- a great skill required in any job is the ability to think and analyze in a right way.  You do not necessarily have to get the answer right in many questions like those below (of course, they expect you to get the answer to above questions right) but you got to show a logical deduction. A few that I know of:
1. How many street lamps are there in New York?
2. Estimate the market for light bulbs in Florida. (if you are into this field)

A lot of questions make use of algebra (simple) and logic.