BRAIN TEASERS
The Most Difficult Tasks (page 52)

The Most Difficult Tasks (page 52)

puzzles, riddles, mathematical problems, mastermind, cinemania... These are the tasks listed 511 to 520.
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Calculate the number 4307

NUMBERMANIA: Calculate the number 4307 using numbers [7, 7, 1, 9, 89, 508] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 0
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Find number abc

If 80370 + 8b77a = c65cba find number abc. Multiple solutions may exist.
Correct answers: 0
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Calculate the number 6550

NUMBERMANIA: Calculate the number 6550 using numbers [2, 7, 1, 5, 19, 941] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 0
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#brainteasers #math #numbermania

A woman was found guilty in tr...

A woman was found guilty in traffic court and when asked for her occupation she said she was a schoolteacher. The judge rose from the bench. "Madam, I have waited years for a schoolteacher to appear before this court."
He smiled with delight. "Now sit down at that table and write 'I will not run a red light' five hundred times."
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MAGIC SQUARE: Calculate A*B-C

The aim is to place the some numbers from the list (6, 7, 8, 25, 26, 27, 45, 54, 55, 56) 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: 0
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#brainteasers #math #magicsquare
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Find number abc

If b7ba1 - c57a5 = c1696 find number abc. Multiple solutions may exist.
Correct answers: 0
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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: 0
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#brainteasers #mastermind
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Calculate the number 6179

NUMBERMANIA: Calculate the number 6179 using numbers [6, 7, 1, 8, 72, 941] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 0
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#brainteasers #math #numbermania
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Find number abc

If 5bc0b - a03c2 = cb067 find number abc. Multiple solutions may exist.
Correct answers: 0
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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: 0
CHECK ANSWER
#brainteasers #mastermind
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Calculate the number 849

NUMBERMANIA: Calculate the number 849 using numbers [1, 4, 5, 2, 71, 775] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 0
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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Auguste Laurent

Born 14 Nov 1807; died 23 Apr 1853 at age 45. French chemist who developed organic chemistry as a distinct science. For a while, he assisted Jean Dumas, and extended his work, understanding organic compounds as derivatives of hydrocarbon molecules. In crystallography he was influenced by René-Just Haüy. Laurent recognised that carbon atoms formed bonds based on a pyramid structure. Furthermore, against the opinion of many peers, he rejected the idea held by Jöns Berzelius that even organic molecules were formed from positively and negatively charged entities. Laurent showed (1836) that a supposedly positive-charge hydrogen atom could be replaced by a supposedly negative-charge chlorine atom. He recognised families of organic compounds with characteristic groups. He died in middle age from tuberculosis.«
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