BRAIN TEASERS
The Most Difficult Tasks (page 3)

The Most Difficult Tasks (page 3)

puzzles, riddles, mathematical problems, mastermind, cinemania... These are the tasks listed 21 to 30.
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Decrypt hidden message

Can you decrypt hidden message (1C42 92S1 T5B38 OV1 IS B3LT5B38S 1C4ROVGC4)?
Correct answers: 5
The first user who solved this task is Sanja Šabović.
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#brainteasers #wordpuzzles #riddles
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Find number abc

If bc17a - 6a575 = 255cb find number abc. Multiple solutions may exist.
Correct answers: 6
The first user who solved this task is Nasrin 24 T.
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#brainteasers #math
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MAGIC SQUARE: Calculate A-B*C

The aim is to place the some numbers from the list (5, 8, 10, 13, 16, 18, 37, 40, 43, 45, 67) 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: 6
The first user who solved this task is Nasrin 24 T.
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#brainteasers #math #magicsquare

Todd Barry: Summer School

I never understood the concept of summer school. The teachers going to go up there and go, OK, class, you know that subject you couldnt grasp in nine months? Were going to whip it out in six weeks.
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Calculate the number 3800

NUMBERMANIA: Calculate the number 3800 using numbers [7, 4, 1, 3, 91, 889] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 6
The first user who solved this task is Nílton Corrêa de Sousa.
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#brainteasers #math #numbermania
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Calculate the number 511

NUMBERMANIA: Calculate the number 511 using numbers [4, 1, 3, 7, 78, 597] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 6
The first user who solved this task is Nílton Corrêa de Sousa.
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#brainteasers #math #numbermania
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Calculate the number 5238

NUMBERMANIA: Calculate the number 5238 using numbers [8, 6, 8, 4, 86, 289] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 6
The first user who solved this task is Fazil Hashim.
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#brainteasers #math #numbermania
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Calculate the number 6890

NUMBERMANIA: Calculate the number 6890 using numbers [7, 6, 7, 6, 76, 455] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 6
The first user who solved this task is Nílton Corrêa de Sousa.
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#brainteasers #math #numbermania
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Calculate the number 808

NUMBERMANIA: Calculate the number 808 using numbers [4, 2, 9, 4, 60, 140] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 6
The first user who solved this task is Nílton Corrêa de Sousa.
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#brainteasers #math #numbermania
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Calculate the number 9712

NUMBERMANIA: Calculate the number 9712 using numbers [3, 7, 4, 6, 16, 962] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 6
The first user who solved this task is Fazil Hashim.
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#brainteasers #math #numbermania
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Calculate the number 6705

NUMBERMANIA: Calculate the number 6705 using numbers [3, 3, 8, 2, 98, 592] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 6
The first user who solved this task is Fazil Hashim.
CHECK ANSWER
#brainteasers #math #numbermania
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The aim is to place the some numbers from the list (8, 9, 14, 24, 25, 30, 45, 46, 51, 89) 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.
Last Correct Answer

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7. Jakubovski Vladimir
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Aluminium isolated

In 1886, Charles M. Hall, a young U.S. chemist, completed his electrolytic process for the separation of aluminum from its ore, a mere eight months since he graduated from college. He dissolved the alumina ore in a bath of cryolyte (a mineral containing flourine, sodium and aluminum) and passed electric current through the solution. The process he patented (2 Apr 1889) was the first to become an inexpensive, commercial application. Production began in Nov 1888 by the Pittsburgh Reduction Company started , which later became ALCOA, the Aluminum Company of America.
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