It is a fascinating topic. I am of the belief that most of the world's water pollution would be eliminated if our charity dollars would go towards sanitary waste disposal.
I used to hate these artificial logic problems, especially where the "correct" answer relies on the assumption by one individual that the others are perfectly intelligent and acting logically.
By the way, the answer to most of these is that the person with the most amount of information cannot be sure of the answer. That added information allows someone with just a bit less information to guess correctly.
I stopped ironing a decade ago and do not have a single wrinkle when I walk out of the house. Nothing goes to the cleaners. No one irons for me. My shirts are 100% cotton. Wrinkles are a choice, not an inevitability.
Hah! Drive from Palm Springs to Indio down Blood Alley. Speed of traffic is 100 mph. Last time I was there, I had to pull into the right hand lane to slow down to 80.
By the way, the answer to most of these is that the person with the most amount of information cannot be sure of the answer. That added information allows someone with just a bit less information to guess correctly.