BRAIN TEASERS
Brain Teasers

Brain Teasers

puzzles, riddles, mathematical problems, word games, mastermind, cinemania, music, sport... These are the tasks listed 1 to 10.
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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 618

NUMBERMANIA: Calculate the number 618 using numbers [1, 9, 2, 3, 11, 621] 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 bc7bc - 17740 = 4a01c find number abc. Multiple solutions may exist.
Correct answers: 0
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#brainteasers #math

Sermon made him pay income tax

After hearing a sermon about lies and deceit, a man wrote the IRS: "I have been unable to sleep, knowing that I have cheated on my income tax. I have reviewed my taxable income and have enclosed a check for $900.
If I still can't sleep, I will send the rest."
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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
CHECK ANSWER
#brainteasers #mastermind
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Calculate the number 6367

NUMBERMANIA: Calculate the number 6367 using numbers [9, 1, 1, 3, 87, 631] 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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MAGIC SQUARE: Calculate A*B-C

The aim is to place the some numbers from the list (13, 15, 16, 18, 20, 23, 37, 39, 44, 61) 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 2baa4 + c992c = 10ba11 find number abc. Multiple solutions may exist.
Correct answers: 0
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#brainteasers #math
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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: 0
CHECK ANSWER
#brainteasers #mastermind
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Calculate the number 9167

NUMBERMANIA: Calculate the number 9167 using numbers [4, 3, 9, 7, 37, 881] 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 c4bab + 4b5ca = a2aa8c find number abc. Multiple solutions may exist.
Correct answers: 0
CHECK ANSWER
#brainteasers #math
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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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Carl Dietrich Harries

Died 3 Nov 1923 at age 57 (born 5 Aug 1866). German chemist and industrialist who was one of the leading scientists in the elastomer field at the turn of the 20th century. He developed the ozonolysis process (Harries reaction) to determine the structure of natural rubber (polyisoprene). Breaking down the natural rubber substance by the action of ozone, Harries determined its molecular structure is made up from long chains containing many hundreds of isoprene molecules bonded together. That insight was followed up by Fritz Hofmann, who accomplished polymerization of pure isoprene to form synthetic rubber (Aug 1909). On 12 Sep 1909, his process was the granted the world's first patent (German No. 250690) on a “Method for producing synthetic rubber.”
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