BRAIN TEASERS
The Most Difficult Tasks (page 183)

The Most Difficult Tasks (page 183)

puzzles, riddles, mathematical problems, mastermind, cinemania... These are the tasks listed 1821 to 1830.
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Find number abc

If 5cb0b - 2b1ba = 2561a find number abc. Multiple solutions may exist.
Correct answers: 10
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MAGIC SQUARE: Calculate A+B-C

The aim is to place the some numbers from the list (3, 21, 26, 27, 31, 32, 34, 37, 48, 64, 69, 74) 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: 10
The first user who solved this task is Nasrin 24 T.
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#brainteasers #math #magicsquare
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Find number abc

If 90a99 + accb9 = cbc6b8 find number abc. Multiple solutions may exist.
Correct answers: 10
The first user who solved this task is Nasrin 24 T.
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#brainteasers #math

You can own a sheep, or ron...

You can own a sheep, or fleece it.
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Calculate the number 903

NUMBERMANIA: Calculate the number 903 using numbers [3, 6, 8, 5, 16, 860] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 10
The first user who solved this task is Nasrin 24 T.
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#brainteasers #math #numbermania
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MAGIC SQUARE: Calculate A-B-C

The aim is to place the some numbers from the list (4, 7, 10, 14, 15, 17, 18, 20, 21, 85, 87) 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: 10
The first user who solved this task is Nasrin 24 T.
CHECK ANSWER
#brainteasers #math #magicsquare
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MAGIC SQUARE: Calculate A+B+C

The aim is to place the some numbers from the list (20, 21, 22, 23, 27, 29, 48, 49, 55, 81) 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: 10
The first user who solved this task is Nasrin 24 T.
CHECK ANSWER
#brainteasers #math #magicsquare
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Calculate the number 3005

NUMBERMANIA: Calculate the number 3005 using numbers [3, 9, 3, 2, 52, 242] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 10
The first user who solved this task is Nasrin 24 T.
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#brainteasers #math #numbermania
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Calculate the number 601

NUMBERMANIA: Calculate the number 601 using numbers [1, 9, 5, 7, 82, 516] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 10
The first user who solved this task is Nasrin 24 T.
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#brainteasers #math #numbermania
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Calculate the number 4730

NUMBERMANIA: Calculate the number 4730 using numbers [3, 2, 7, 8, 19, 917] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 10
The first user who solved this task is Nasrin 24 T.
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#brainteasers #math #numbermania
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Calculate the number 3282

NUMBERMANIA: Calculate the number 3282 using numbers [9, 9, 9, 3, 28, 155] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 10
The first user who solved this task is NĂ­lton CorrĂȘa de Sousa.
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#brainteasers #math #numbermania
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Tin can key opener patented

In 1866, the first U.S. patent for a tin can with a key opener was issued to J. Osterhoudt of New York City (No. 58,554). Described as an "improved method of opening tin cans," the can featured a projecting lip and key.«*
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