BRAIN TEASERS
The Most Difficult Tasks (page 138)

The Most Difficult Tasks (page 138)

puzzles, riddles, mathematical problems, mastermind, cinemania... These are the tasks listed 1371 to 1380.
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Find number abc

If b8a00 - b554b = c151 find number abc. Multiple solutions may exist.
Correct answers: 4
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#brainteasers #math
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What a winning 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: 4
CHECK ANSWER
#brainteasers #mastermind
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Find number abc

If 73ac6 + bbc63 = 161a69 find number abc. Multiple solutions may exist.
Correct answers: 4
CHECK ANSWER
#brainteasers #math

Although this married couple e...

Although this married couple enjoyed their luxury fishing boat together, it was the husband who was always behind the wheel operating the boat. He was concerned about what might happen in an emergency. So one day out on the lake he suddenly said to his wife, "Ok honey, this is a drill. Pretend that I am having a heart attack. You must get the boat safely to shore."
She was initially surprised and flustered, but she soon settled down and was able to safely drive the boat to shore.
Later that evening, the wife walked into the living room where her husband was watching television. She sat down next to him, grabbed the remote control, switched the channel, and said to him, "OK honey, this is a drill. Pretend I'm having a heart attack. You must set the table, cook dinner, and wash the dishes."
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Which is a winning combination of digits?

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: 4
CHECK ANSWER
#brainteasers #mastermind
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Find number abc

If c6cb4 - c1a0a = 56ba find number abc. Multiple solutions may exist.
Correct answers: 4
CHECK ANSWER
#brainteasers #math
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MAGIC SQUARE: Calculate A+B+C

The aim is to place the some numbers from the list (6, 7, 12, 24, 25, 30, 36, 37, 42, 97) into the empty squares and squares marked with A, B an C. Sum of each row and column should be equal. All the numbers of the magic square must be different. Find values for A, B, and C. Solution is A+B+C.
Correct answers: 4
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#brainteasers #math #magicsquare
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Find number abc

If bc32b + c2584 = abacaa find number abc. Multiple solutions may exist.
Correct answers: 4
CHECK ANSWER
#brainteasers #math
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Which is a winning combination of digits?

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: 4
CHECK ANSWER
#brainteasers #mastermind
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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: 4
CHECK ANSWER
#brainteasers #mastermind
[link]

What a winning 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: 4
CHECK ANSWER
#brainteasers #mastermind
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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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Goldbach's conjecture

In 1742, the Russian mathematician Christian Goldbach dated a letter to Leonhard Euler in which he presented his famous conjecture. Stated in modern terms, Goldberg's conjecture proposes that “Every even natural number greater than 2 is equal to the sum of two prime numbers.”It has been checked by computer for vast numbers - up to at least 4 x 1014 - but still remains unproved. Goldbach also studied infinite sums, the theory of curves and the theory of equations.«[Image: Letter to Euler, in which Goldbach presented his conjecture.]
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