Brainteasers 脑筋急转弯

Phone Directory

In a certain city, 5% of all the persons in town have unlisted phone numbers. If you select 100 names at random from that city’s phone directory, how many people selected will have unlisted phone numbers?

Answer:
None. If their names are in the phone directory, they do not have unlisted phone numbers!

Boy and the Carny

A boy was at a carnival and went to a booth where a man said to the boy, “If I write your exact weight on this piece of paper then you have to give me $50, but if I cannot, I will pay you $50.” The boy looked around and saw no scale so he agreed, thinking no matter what the carny writes he’ll just say he weighs more or less.
In the end the boy ended up paying the man $50. How did the man win the bet?

Answer:
The man did exactly as he said he would and wrote “your exact weight” on the paper.

Bartender and Drink

One day two men walked into the bar. Both men were exactly alike. They both sat down for the bartender to fix them a drink. The first man sat down, waited on the bartender to fix his drink. When it was given to him he drunk it very fast, left, and had a happy life. The next man sat down, and waited on the bartender to fix his drink. When the drink was given to him he drunk it very slowly, and died right there on the spot. Why did the first man live but the second man die?

Answer:
The bartender placed a poison in both of the drinks. The trick is, the poison was in the ice. So, the first man drank the drink so fast that the ice didn’t melt, so the poison did not get in his drink. The second man drank the drink too slow, so the ice had time to melt out into the drink. The poison got into his drink and he died.

. phone directory: 电话号码簿。
. at random: 任意地，随便地。
. carny: 〈美口〉流动游艺场的工作（表演）人员。
. carnival: 嘉年华会；booth: （游乐场上的）摊位。
. end up: 以……结束（尤指意料之外地）。
. bartender: 〈美〉酒吧服务员。
. poison: 毒药，毒物。