Answer:
What was the longest river in the world before the Amazon River was discovered?
What coin doubles in value when half is deducted?
10 fish are in a tank. 2 Drown, 4 Swim away, and 3 Die. How many are left?
How can you throw a ball 20 meters, and have it come back to you without hitting anything?
You are participating in the swimming finals at the Olympics. In the final few seconds of the race you narrowly pass the swimmer who was in third place. What place did you get?
It is something you make after you've weighed your options.