There are 21 prisoners in separate rooms. Every day, one prisoner is taken to a special room and must flip exactly 1 or 2 light switches.
No matter how many days have passed, every prisoner will still enter the room again at some point.
At any time, any prisoner may claim that all the prisoners have entered the room. If he is right, they are all freed. Otherwise, they are all killed.
What strategy could they have come up with before being imprisoned that would ensure their freedom?
WHAT NEXT?
Help the prisoner make a clean break and submit your strategy here
A train goes between Chicago and New York. The brakeman, the fireman, and the engineer are named Smith, Jones and Brown (names are not in order).
There are also three passengers named Mr. Smith, Mr. Jones, and Mr. Brown.
Mr. Brown lives in New York. The brakeman lives halfway between New York and Chicago.
Mr. Jones earns exactly $20,000 per year.
Smith beat the fireman at their last game of golf.
The passenger who lives in Chicago has the same name as the brakeman.
The brakeman’s next door neighbor is a passenger on this train and earns exactly three times as much as the brakeman.
What is the name of the engineer?
WHAT NEXT?
A who’s who challenge! Think you know? Show us how
A customer in a shoe store bought a pair of shoes that were on sale for $15.00.
The customer gave the salesman a $20.00 bill. The salesman did not have change, and went to an adjoining store and asked for change.
The owner of the store gave the salesman a $10.00 and two $5.00 bills. The salesman returned and gave the customer his shoes and $5.00 change. The customer left happily.
After the customer left, the owner of adjoining store came to the shoe store and told the salesman his $20.00 was a counterfeit. The salesman looked at the bill, agreed it was worthless, and repaid the owner with a good $20.00.
That night, as the salesman was closing the store, they began thinking about what he had lost in this series of transactions.
What did he lose?
WHAT NEXT?
Was it their dignity? Who knows! Do you? Show us how
