BRAIN TEASERS
The Most Difficult Tasks (page 157)

The Most Difficult Tasks (page 157)

puzzles, riddles, mathematical problems, mastermind, cinemania... These are the tasks listed 1561 to 1570.
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Find number abc

If b4c09 - cb9a2 = 2cc3a find number abc. Multiple solutions may exist.
Correct answers: 5
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#brainteasers #math
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Calculate the number 595

NUMBERMANIA: Calculate the number 595 using numbers [5, 2, 8, 2, 52, 571] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 5
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#brainteasers #math #numbermania
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Find the right combination

The computer chose a secret code (sequence of 4 digits from 1 to 6). Your goal is to find that code. Black circles indicate the number of hits on the right spot. White circles indicate the number of hits on the wrong spot.
Correct answers: 5
CHECK ANSWER
#brainteasers #mastermind

Switched Inputs

For a computer programming class, I sat directly across from someone, and our computers were facing away from each other. A few minutes into the class, she got up to leave the room. I reached between our computers and switched the inputs for the keyboards. She came back and started typing and immediately got a distressed look on her face. She called the teacher over and explained that no matter what she typed, nothing would happen.
The teacher tried everything. By this time I was hiding behind my monitor and quaking red-faced. I started to type, "Leave me alone!" They both jumped back, silenced. "Whaa??" the teacher blubbered.
Then I typed, "I said leave me alone!" The kid got really upset. "I didn't do anything to it, I swear!" It was all I could do to keep from laughing out loud. The conversation between them and HAL 2000 went on for an amazing five minutes.
Me: "Don't touch me!"
Her: "I'm sorry, I didn't mean to hit your keys that hard."
Me: "Who do you think you are anyway?!" Etc.
Finally, I couldn't contain myself any longer and fell out of my chair laughing. After they had realised what I had done, they both turned beet red. Funny, I never got more than a C- in that class.
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Find number abc

If 86358 - 2a65b = 6c6bb find number abc. Multiple solutions may exist.
Correct answers: 5
CHECK ANSWER
#brainteasers #math
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Find number abc

If c66cb + bb16a = 103ba6 find number abc. Multiple solutions may exist.
Correct answers: 5
CHECK ANSWER
#brainteasers #math
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Find number abc

If ab6c3 + cbaaa = 69c68 find number abc. Multiple solutions may exist.
Correct answers: 5
CHECK ANSWER
#brainteasers #math
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Calculate the number 832

NUMBERMANIA: Calculate the number 832 using numbers [9, 1, 9, 1, 38, 793] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 5
CHECK ANSWER
#brainteasers #math #numbermania
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Find number abc

If c2ba4 - bb6a9 = a869c find number abc. Multiple solutions may exist.
Correct answers: 5
CHECK ANSWER
#brainteasers #math
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Find number abc

If 73a6c + 75bbc = 1c91cb find number abc. Multiple solutions may exist.
Correct answers: 5
CHECK ANSWER
#brainteasers #math
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Calculate the number 1188

NUMBERMANIA: Calculate the number 1188 using numbers [2, 9, 5, 7, 66, 545] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 5
CHECK ANSWER
#brainteasers #math #numbermania
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The computer chose a secret code (sequence of 4 digits from 1 to 6). Your goal is to find that code. Black circles indicate the number of hits on the right spot. White circles indicate the number of hits on the wrong spot.
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Maria Mitchell

In 1847, Maria Mitchell, the first woman astronomer in the United States, discovered a comet. One night in the Autumn of 1847, Maria looked at the sky through the telescope in her homemade observatory at Nantucket, Mass. and saw a star five degrees above the North Star where there had been no star before. She had memorized the sky and was sure of her observation. It occurred to her that this might be a comet. Maria recorded the presumed comet's coordinates. The next night the star moved again. This time she was sure it was a comet. For this discovery, she was awarded a gold medal by the king of Denmark. She became the first woman elected to the American Academy of Arts and Sciences.
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