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Monday, January 23, 2017

Brain Teaser for 1/24/2017

A Couple Of Logic Teasers

1. There is a town in Texas where 5% of all the people living there have unlisted phone numbers. If you selected 100 names at random from the town's phone directory, on average, how many of these people would have unlisted phone numbers?

2. One morning a man is leaving on business trip and finds he left some paperwork at his office. He runs into his office to get it and the night watchman stops him and says, "Sir, don't get on the plane. I had a dream last night that the plane would crash and everyone would die!" The man takes his word and cancels his trip. Sure enough the plane crashes and everyone dies. The next morning the man gives the watchman a $1,000 reward for saving his life and then fires him. Why did he fire the watchman that saved his life?
Solution
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The Big Book of Brain Games: 1,000 PlayThinks of Art, Mathematics & Science

1 comment:

Anonymous said...

1. Zero, because the 5% are unlisted so did not make it to directory

2. Because watchman slept and had dream. He is not supposed to sleep when on duty.