Brain Teasers & Puzzles
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Every Year, five couples make their annual trek up a mountain and have a picnic lunch together at the top. Each couple consists of one man (Craig, Bob, Harold, Larry, or Pete) and one woman (Eileen, Phyllis, Victoria, Sally, or Lisa) Each couple brought one item to share (potato salad, hamburgers, pasta salad, dinner rolls, or hot dogs). Using the clues, determine who is a couple and who brought what item.
1. Phyllis and her husband brought the hamburgers
2. Harold and his wife are vegetarians
3. Craig asked Victoria for her pasta salad recipe
4. Both Harold and Craig were guests at Eileen’s wedding
5. Bob and Lisa have been happily married for 25 years
6. Larry and his wife brought the rolls
7. Sally brought hot dogs
8. Phyllis and her husband were guests at Craig’s wedding
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Sasha is thinking about investing 20.000 dollars in a company, which offers him a five-year plan of divident payment at the end of each year: At the end of the first year, he will get 2000 dollars. At the end of the second year, he will get 4000 dollars. At the end of the third year, he will get 6000 dollars. At the end of the fourth year, he will get 6000 dollars again, and at the end of the last year of payment plan, he will get 5000 dollars.
What is the maximum interest rate a bank could offer to Sasha, so that the investment in the company is more payable for him than making a deposit in a bank?
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At the pharmacy, Mark has asked for 80% alcohol, but the pharmacy doesn’t have one, so he bought half liter of 96% alcohol and a liter of distilled water. How much distilled water does he need to pour into the half liter of 96% alcohol, so he could get 80% alcohol product?
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Two Arabs, one of whom is carrying 5 slices of bread, and the other one carrying 3 slices of bread, meet up with a wealthy but hungry passenger in the desert. All 3 of them eat together and everybody eats the same amount of food.The passenger pays 8 coins and continues on his way.
How are the two Arabs supposed to split the money so each of them gets a fair amount?
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You are visiting New York City when a man approaches you.
\”Not counting bald people, I bet a hundred bucks that there are two people living in New York City with the same number of hairs on their heads,\” he tells you.
\”I\’ll take that bet!\” you say. You talk to the man for a minute, after which you realize you have lost the bet.What did the man say to prove his case?
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Two robots are placed at different points on a straight line of infinite length. When they are first placed down, they each spray out some oil to mark their starting points.
You must program each robot to ensure that the robots will eventually crash into each other. A program can consist of the following four instructions:
- Go left one space
- Go right one space
- Skip the next instruction if there is oil in my current spot
- Go to a label
[Note that a “label” is a name that refers to a line of your code. For example, you could label the third line of your program “surveying”. Then, the instruction “goto surveying” would jump to line 3 and start executing from there on the next cycle.]
A robot will carry out one instruction per second. Both robots need not have the same program. Note that you won’t know ahead of time which robot is on the left and which is on the right.
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