The Brain Teaser: Scroll Down for your Solution
1. George, Helen, and Steve are drinking coffee.
Bert, Karen, and Dave are drinking soda.
Using logic, is Elizabeth drinking coffee or soda?
2. A piece of firewood is standing on end. Which is more likely to knock the piece of wood over - a lead bullet fired from a gun or a rubber bullet of the same mass traveling at the same speed (and hitting the same spot)? Assume that the rubber bullet does not disintegrate on impact.
1. Elizabeth is drinking coffee. The letter E appears twice in her name, as it does in the names of the others that are drinking coffee.
2. The rubber bullet will be more likely to knock the wood over. The lead bullet will embed itself in the wood, so the wood will have to absorb enough energy to stop the bullet's momentum. The rubber bullet will ricochet off of the wood, so the wood will have to absorb enough energy to stop the bullet PLUS send the bullet back in the opposite direction. The rubber bullet will supply more total force to the wood and will therefore be more likely to knock it over.